>>> TONIGHT BREAKING NEWS. THE DEADLY FLASH FLOODING EMERGENCY. RESCUES UNDER WAY. ROADS DESTROYED. CARS SWEPT AWAY. PARTS OF A RAILROAD WASHED OUT. LIVES TURNED UPSIDE DOWN. A WOMAN DIES TRYING TO REACH HIGHER GROUND. AND MORE RAIN ON THE WAY. 9 MILLION STILL AT RISK OF FLOODING, INCLUDING ALMOST ALL OF VERMONT. OUR TEAM INSIDE THE FLOOD ZONE. AL ROKER STANDING BY. >>> THE MANHUNT FOR A MURDERER AND KIDNAPPING SUSPECT WHO BROKE OUT OF JAIL USING BEDSHEETS TIED TOGETHER. DESCRIBED AS A SURVIVALIST HIDING OUT AS COMMUNITIES ARE ON EDGE. >>> DR. LARRY NASSAR STABBED ALMOST A DOZEN TIMES IN HIS FEDERAL PRISON, INCLUDING IN THE NECK AND BACK. A LATE UPDATE ON THE MAN CONVICTED OF SEXUALLY ABUSING YOUNG ATHLETES. WHAT ONE OF HIS VICTIMS IS SAYING TONIGHT. >>> ALSO BREAKING, AS THE PRESIDENT AND KING CHARLES MEET IN LONDON, NEWS NATO WILL EXPAND AMID THE WAR IN UKRAINE. THE COUNTRY ON THE VERGE OF BEING ADMITTED. PLUS LATE WORD ON A NEW MEETING BETWEEN PRESIDENT BIDEN AND ZELENSKYY. >>> MADONNA NOW OUT OF ONES AND OBJECTS WHILE THEY PERFORM? >>> PRIME WARNING. THE ENERGY DRINK WITH CAFFEINE EQUAL TO SIX SODAS THAT KIDS CAN'T SHOW EVER. >> Announcer: THIS IS NBC "NIGHTLY NEWS" WITH LESTER HOLT. >>> AND GOOD EVENING. I'M TOM LLAMAS IN FOR LESTER. WE WANT TO GET RIGHT TO THAT BREAKING NEWS. A TYPE OF WEATHER EVENT THEY SAY HAPPENS ONLY ONCE EVERY 1,000 YEARS. CLOSE TO TEN INCHES OF RAIN, A SUMMER'S WORTH, ESSENTIALLY FALLING IN SOME AREAS IN JUST HOURS. THE RESULT, FLASH FLOODING THAT TURNED DANGEROUS AND DEADLY WITH A WOMAN BEING SWEPT AWAY TRYING TO REACH HIGHER GROUND. THERE HAVE WITHIN DOZENS OF RESCUES, MANY OF THEM IN NEW YORK, WHILE IN VERMONT ALMOST THAT ENTIRE STATE UNDER A FLOOD WARNING TONIGHT. 9 MILLION AT RISK FOR FLASH FLOODING, WHICH HAS DESTROYED DOZENS OF ROADS AND WIPED OUT TRACKS ON A BUSY COMMUTER RAILROAD SERVICING NEW YORK CITY. AND IT'S NOT JUST HERE IN THE NORTHEAST. MUCH OF THE SOUTH AND SOUTHWEST STILL DEALING WITH A BRUTAL HEAT WAVE. IN A MOMENT AL ROKER WILL TELL US WHERE THAT HEAT DOME HAS MOVED AND WHAT'S NEXT. BUT WE BEGIN WITH EMILIE IKEDA IN HARD-HIT NEW YORK. EMILIE, SO MANY THERE CAUGHT OFF GUARD WITH THIS FLOODING. >> Reporter: TOM, ABSOLUTELY. OFFICIALS CALLED THE FLOODING HERE A ONCE IN 1,000-YEAR EVENT WITH ENOUGH FORCE TO EVEN DISLODGE GUARDRAILS AS YOU CAN SEE BEHIND ME. AND THE UNRELENTING RAIN ISN'T OVER YET FOR THOSE NORTH OF US. TONIGHT A BRUTAL BOUT OF STORMS INCHES NORTH. WASHING OUT ROADS AND KICKING SWIFT WATER RESCUE TEAMS INTO HIGH GEAR. STATES OF EMERGENCY DECLARED IN PARTS OF NEW YORK, CONNECTICUT AND VERMONT. >> I'M KRISTEN DAHLGREN HERE IN VERMONT WHERE THE RAIN JUST ISN'T LETTING UP. SOME TOWNS HAVE ALREADY SEEN OVER 7.5 INCHES. FLASH FLOODING HAS CUT OFF ENTIRE COMMUNITIES. DOZENS OF ROADS ARE CLOSED. AND NOW SOME RIVERS ARE APPROACHING MAJOR FLOOD STAGE. ALMOST THE ENTIRE STATE STILL ON HIGH ALERT AS WE HEAD INTO THE OVERNIGHT HOURS. >> Reporter: WATCH AS FLOOD WATERS POUR OVER THIS DAM. THE GOVERNOR THERE COMPARING THE RELENTLESS RAIN TO TROPICAL STORM IRENE IN 2011. >> THIS IS AN ALL HANDS ON DECK RESPONSE. WE ARE CLOSELY COORDINATING WITH FEDERAL PARTNERS. >> Reporter: THE DANGEROUS DOWNPOUR COMES AS RESIDENTS IN NEW YORK'S HUDSON VALLEY TODAY ARE DIGGING OUT. >> EVERYTHING'S DESTROYED. >> Reporter: A SUMMER'S WORTH OF RAIN FALLING IN JUST A DAY, COLLAPSING ROADWAYS AND STRANDING CARS IN DANGEROUS FLASH FLOODING. >> I'VE BEEN HERE 16 YEARS. I'D NEVER SEEN FLOODING LIKE THIS AT ALL. >> Reporter: NEW YORK STATE TROOPERS USED ROPES SUNDAY TO RESCUE DRIVERS. AND AUTHORITIES HAD TO SAVE 700 PASSENGERS STUCK ABOARD AMTRAK IN PUTNAM COUNTY. >> THEY'RE CALLING THIS A 1,000-YEAR EVENT. >> Reporter: AUTHORITIES SAY 43-YEAR-OLD PAMELA NUGENT DIED WHILE TRYING TO EVACUATE HER HOME THAT HAD BEEN OVERTAKEN BY WATER. >> IT LOOKED LIKE A RAGING OCEAN WITH A HURRICANE. >> Reporter: NEARBY, SAVANNAH PITCHER WADED THROUGH TREACHEROUS FLOODWATERS TO REACH HER GRANDMOTHER AND HELP GUIDE HER TO HIGHER GROUND. IF YOU HAD NOT GOTTEN TO YOUR GRANDMOTHER, WHAT DO YOU THINK WOULD HAVE HAPPENED? >> I DON'T THINK EVERYBODY WOULD BE OKAY. HONESTLY. >> I DIDN'T WANT MY CAR TO SWIM AWAY. >> Reporter: TONIGHT IN PENNSYLVANIA RESIDENTS ARE FACING THE AFTERMATH OF READING'S WETTEST DAY IN THREE YEARS. WHILE BACK IN VERMONT FIRST RESPONDERS ARE BRACING FOR A POTENTIALLY LONG NIGHT. >> ALL RIGHT. EMILIE IKEDA JOINS US NOW LIVE. EMILIE, YOU'RE IN ONE OF THE WORST-HIT TOWNS IN NEW YORK. GIVE US A SENSE OF THE IMPACT THERE. >> Reporter: WELL, TOM, IF YOU TAKE A LOOK AT THE DAMAGED BRIDGE BEHIND ME YOU CAN GET A SENSE FOR JUST HOW HIGH THOSE RACING FLOODWATERS REACH WITH DEBRIS STUCK IN THE FENCING. AND YOU CAN SEE WHY ROADWAYS ARE EXPECTED TO BE CLOSED FOR THE FORESEEABLE FUTURE. THE SWEEPING STORMS ALSO IMPACTING AMTRAK'S SERVICE AND DISRUPTING THOUSANDS OF FLIGHTS. TOM? >> ALL RIGHT. EMILIE IKEDA LEADING US OFF TONIGHT. LET'S GET RIGHT OVER TO AL ROKER, WHO'S TRACKING THIS FLOODING THREAT AND DANGEROUS HEAT. AND AL, ALL ACROSS THE COUNTRY THERE ARE THESE POCKETS OF EXTREME WEATHER. >> THAT'S RIGHT. AND IT'S JUST GOING TO CONTINUE, TOM. YOU LOOK RIGHT NOW THE HEAVIEST RAIN IN NEW ENGLAND MAKING ITS WAY SLOWLY UP TO THE NORTH. WE STILL HAVE FLASH FLOOD WATCHES AND WARNINGS OUT THERE FOR 9 MILLION PEOPLE. COULD BE ANOTHER 4 TO 8 MORE INCHES OF RAIN. AND FROM MIAMI TO CALIFORNIA 55 MILLION PEOPLE UNDER HEAT ADVISORIES, HEAT WARNINGS AND HEAT WATCHES BECAUSE THIS HIGH PRESSURE'S JUST PARKED OVER THE SOUTHWEST WITH THE JET STREAM UP TO THE NORTH. TRIPLE DIGITS FOR THE NEXT THREE DAYS FOR VEGAS, ALBUQUERQUE, LUBBOCK, EL PASO AND PHOENIX. AND FOR TOMORROW FROM MIAMI TO NEW ORLEANS TRIPLE-DIGIT HUMIDITY MAKING IT FEEL LIKE IT'S IN THE TRIPLE DIGITS, TOM. DANGEROUS CONDITIONS. AND THIS LASTS RIGHT ON INTO NEXT WEEK. >> YEAH. GOING TO BE A BUSY WEEK FOR YOU AND THE WEATHER TEAM. ALL RIGHT, AL, THANK YOU FOR THAT. >>> WE WANT TO TURN TO PENNSYLVANIA AND THE SEARCH INTENSIFYING TONIGHT FOR AN ESCAPED MURDER SUSPECT WHO AUTHORITIES SAY LOWERED HIMSELF OUT OF A JAIL BY TYING BEDSHEETS TOGETHER INTO A ROPE. HE'S ALSO APPARENTLY A SURVIVALIST WITH MILITARY TRAINING. RON ALLEN IS THERE TONIGHT. >> Reporter: DAY FOUR OF A MASSIVE MANHUNT FOR A FUGITIVE POLICE SAY SHOULD BE CONSIDERED ARMED AND EXTREMELY DANGEROUS. THIS MAN, MICHAEL BURHAM, 34, A SUSPECT WANTED IN CASES INVOLVING MURDER, RAPE AND OTHER VIOLENT FELONIES. WHO AUTHORITIES SAY ESCAPED FROM THIS COUNTY JAIL LATE THURSDAY NIGHT USING BEDSHEETS TO LOWER HIMSELF FROM THE ROOF OF A RECREATION AREA. THE DRAMA PLAYING OUT IN SMALL HEAVILY WOODED COMMUNITIES ALONG THE NEW YORK-PENNSYLVANIA BORDER. THE SEARCH EXTENDING INTO A NATIONAL FOREST HALF A MILLION ACRES DEEP. >> DO YOU FEEL LIKE YOU'VE BEEN CLOSE TO GETTING HIM AT ALL? >> I BELIEVE THAT WE ARE ACTIVELY AND AGGRESSIVELY PUSHING HIM. I DON'T WANT TO SAY ANY MORE THAN THAT. >> Reporter: POLICE SAY BURHAM IS A SURVIVALIST WITH MILITARY TRAINING AND THAT THEY FOUND SUPPLIES AND CAMP SITES HE'S LIKELY USED AND SUSPECTS SOMEONE MAY BE HELPING HIM. AUTHORITIES WARNING RESIDENTS TO SECURE HOMES, BUSINESSES AND PROPERTY THE SUSPECT MIGHT FIND USEFUL, LEAVING MANY HERE ON EDGE. >> I JUST THINK IT'S SCARY NOT KNOWING LIKE WHAT'S GOING TO HAPPEN. NOT KNOWING WHERE HE IS. >> WE'RE GOING OUT TO OUR CARS. WE'RE CHECKING OUR CAMPER WHICH HAS BEEN PROPPED UP FOR THE SURNL SEASON, CHECKING OUR GARAGES. >> Reporter: THE SECOND TIME IN RECENT MONTHS POLICE SAY BURHAM HAS ELUDED CAPTURE. >> THAT'S A CONCERN FOR US FROM THE STANDPOINT THAT HE HAS EXPERIENCE IN RUNNING FROM LAW ENFORCEMENT. >> Reporter: AFTER HE WAS ACCUSED OF ALLEGEDLY KIDNAPPING AN ELDERLY COUPLE AS POLICE INVESTIGATING THE MURDER OF A WOMAN BURHAM ALLEGEDLY RAPED CLOSED IN ON HIM IN MAY. POLICE CAPTURED BURHAM 13 DAYS LATER IN SOUTH CAROLINA. COURT DOCUMENTS SHOW HE LEFT BEHIND A NOTE APPARENTLY APOLOGIZING FOR ALL THE PROBLEMS HE'D CAUSED HIS FAMILY. IT'S WHEN AUTHORITIES BROUGHT HIM BACK HERE TO PENNSYLVANIA TO FACE CHARGES HE'S ONCE AGAIN ON THE RUN. >> AND WITH THAT RON JOINS US TONIGHT FROM THE JAIL WHERE THE FUGITIVE ESCAPED FROM. AND BECAUSE OF HIS BACKGROUND, RON, THOSE WOODS COULD MAKE THIS VERY TOUGH FOR INVESTIGATORS. >> Reporter: YES. AUTHORITIES SAY HE HAS A LOT OF EXPERIENCE SURVIVING IN THE GREAT OUTDOORS. HE'S FROM THIS COMMUNITY AND APPARENTLY KNOWS THE AREA WELL. AUTHORITIES ARE SAYING THAT FOR REASONS THEY WON'T DETAIL PUBLICLY THAT THEY DO NOT THINK THAT HE HAS GONE VERY FAR. TOM? >> RON ALLEN FOR US. RON, THANK YOU FOR THAT. >>> ALSO TONIGHT, THE STUNNING NEWS. CONVICTED SEX OFFENDER DR. LARRY NASSAR STABBED MULTIPLE TIMES IN A FEDERAL PRISON IN FLORIDA. NASSAR WAS CONVICTED OF SEXUALLY ABUSING YOUNG ATHLETES AND ACCUSED BY HUNDREDS INCLUDING OLYMPIC GYMNASTS. STEPHANIE GOSK HAS LATE DETAILS. >> Reporter: FORMER USA GYMNASTICS DOCTOR AND CONFESSED CHILD SEX ABUSER LARRY NASSAR WAS STABBED NEARLY A DOZEN TIMES INCLUDING TWICE IN THE NECK IN THIS FLORIDA FEDERAL PRISON. THE PRESIDENT OF THE UNION REPRESENTING PRISON EMPLOYEES TELLING NBC NEWS NASSAR HAS A COLLAPSED LUNG AND IS IN STABLE CONDITION. THE ONE-TIME HEAD DOCTOR FOR USA GYMNASTICS IS SERVING WHAT AMOUNTS TO A LIFE SENTENCE FOR SEXUALLY ABUSING MINORS AND POSSESSING CHILD PORNOGRAPHY. OLYMPIC GOLD MEDAL WINNERS INCLUDING THE ENTIRE 2012 TEAM AMONG THE ABUSED. >> VIOLENCE WASN'T WHAT ANY OF US WERE LOOKING FOR. >> Reporter: SARAH KLEIN IS AN ATTORNEY FOR NASSAR'S VICTIMS AND A VICTIM HERSELF. >> WE WERE PERFECTLY SATISFIED WITH THE LAWFUL AND PAINFUL SENTENCE OF LIFE IN PRISON THAT NASSAR WAS GIVEN IN A PROPER COURT OF LAW. >> Reporter: IN 2018 HUNDREDS OF VICTIMS TOLD THEIR STORIES IN MICHIGAN STATE COURT. >> HE BETRAYED MY TRUST, TOOK ADVANTAGE OF MY YOUTH, AND SEXUALLY ABUSED ME HUNDREDS OF TIMES. >> Reporter: NASSAR'S CRIMES LED TO MASSIVE SETTLEMENTS WITH VICTIMS. USA GYMNASTICS AND THE U.S. OLYMPIC COMMITTEE AGREED TO PAY 380 MILLION. AND THE FBI FACES A MORE THAN BILLION-DOLLAR LAWSUIT AFTER A DOJ REPORT HIGHLIGHTED THE AGENCY'S INVESTIGATIVE FAILURES. >> THE FBI MADE ME FEEL LIKE MY ABUSE DIDN'T COUNT AND IT WASN'T A BIG DEAL. >> Reporter: OLYMPIC STARS ALY RAISMAN AND SIMONE BILES TESTIFIED ON CAPITOL HILL. >> I DON'T WANT ANOTHER YOUNG GYMNAST, OLYMPIC ATHLETE OR ANY INDIVIDUAL TO EXPERIENCE THE HORROR THAT I AND HUNDREDS OF OTHERS HAVE ENDURED. >> STEPHANIE JOINS US NOW ON SET. THIS WAS SUCH A VIOLENT ATTACK. WHAT DO WE KNOW ABOUT THIS PRISON IN FLORIDA? >> SO IT'S A HIGH SECURITY PRISON WITH 1,200 INMATES. BUT THIS ISN'T THE ONLY TIME NASSAR'S BEEN ATTACKED. HE WAS ATTACKED BEFORE IN A DIFFERENT PRISON IN ARIZONA WITHIN HOURS OF BEING RELEASED IN THE GENERAL POPULATION ACCORDING TO REPORTS CITING COURT DOCUMENTS. HE WAS REMOVED FROM THAT PRISON FOR HIS SAFETY. >> ALL RIGHT. STEPHANIE GOSK. WE APPRECIATE THAT. >>> THERE'S ALSO BREAKING NEWS OVERSEAS TONIGHT. AMID THE WAR IN UKRAINE, NATO IS SET TO EXPAND. SWEDEN NOW ONE STEP CLOSER TO JOINING. IT COMES AS PRESIDENT BIDEN JOINS OTHER LEADERS TOMORROW AT A NATO SUMMIT IN LITHUANIA. PETER ALEXANDER IS THERE TONIGHT FOR US. AND PETER, A LOT OF NEWS BREAKING THERE. >> Reporter: YEAH, TOM, THAT'S RIGHT. PRESIDENT BIDEN TONIGHT IS APPLAUDING TURKEY AFTER THAT SURPRISE ANNOUNCEMENT THAT IT IS DROPPING ITS OPPOSITION TO SWEDEN'S BID TO JOIN NATO, A MOVE THAT NATO SECRETARY-GENERAL TONIGHT IS CALLING A HISTORIC STEP. TONIGHT A STUNNING REVERSAL AHEAD OF TUESDAY'S NATO SUMMIT. TURKEY AGREEING TO SUPPORT SWEDEN'S BID TO JOIN THE NATO MILITARY ALLIANCE AFTER A YEAR OF OPPOSITION. TURKISH PRESIDENT ERDOGAN MAKING THE DECISION AFTER TALKS WITH THE NATO SECRETARY-GENERAL. PRESIDENT BIDEN ALSO SPEAKING WITH ERDOGAN, AGREEING TO MEET IN PERSON TOMORROW. AFTER BEGINNING HIS DAY IN THE UNITED KINGDOM, PRESIDENT BIDEN TODAY ENJOYED HIS FIRST VISIT WITH KING CHARLES. ♪♪ THE TWO AT WINDSOR CASTLE APPEARING RELAXED, LAUGHING AND SMILING TOGETHER. THE KING SEEMINGLY UNFAZED AS THE PRESIDENT BROKE ROYAL PROTOCOL, PLACING HIS HAND ON THE KING'S BACK. BEFORE DISCUSSING CLIMATE INITIATIVES, A PERSONAL PASSION FOR THE KING. IT FOLLOWED PRESIDENT BIDEN'S FACE TO FACE WITH BRITISH PRIME MINISTER RISHI SUNAK AHEAD OF THIS WEEK'S NATO SUMMIT IN LITHUANIA. THE PRESIDENT LANDING THERE TONIGHT, JUST A FEW HUNDRED MILES FROM THE FIGHTING IN UKRAINE. WITH LAST MONTH'S REBELLION EXPOSING NEW CRACKS IN VLADIMIR PUTIN'S LEADERSHIP PRESIDENT BIDEN WILL LOOK TO FORTIFY NATO EVEN AS HE DISMISSED UKRAINE'S PUSH TO JOIN THE ALLIANCE, RAISING CONCERNS ABOUT HOW THAT WOULD IMPACT THE JOINT DEFENSE AGREEMENT. >> IT'S A COMMITMENT THAT WE'VE ALL MADE NO MATTER WHAT. IF THE WAR'S GOING ON, THEN WE'RE ALL IN THE WAR. YOU KNOW, WE'RE AT WAR WITH RUSSIA IF THAT WERE THE CASE. >> Reporter: LATE TONIGHT A WHITE HOUSE OFFICIAL TELLING NBC NEWS PRESIDENT BIDEN'S EXPECTED TO MEET WITH PRESIDENT ZELENSKYY TOMORROW HERE IN LITHUANIA. TRAVELING WITH THE PRESIDENT, PETER ALEXANDER, NBC NEWS, VILNIUS, LITHUANIA. >>> AND WE LEARNED TODAY THAT THE LEADER OF RUSSIA'S WAGNER MERCENARY GROUP MET WITH PRESIDENT PUTIN JUST DAYS AFTER THREATENING TO STORM MOSCOW. KEIR SIMMONS JOINS US NOW WITH MORE ABOUT THAT. KEIR, WHAT DID WE LEARN ABOUT THIS MEETING? >> Reporter: WELL, IT IS BIZARRE, TOM. HARD TO FATHOM. WHAT WE'RE BEING TOLD BY THE KREMLIN, WHICH CAN'T BE CONFIRMED BY NBC NEWS, IS THAT JUST FIVE DAYS AFTER A MUTINY THAT PRESIDENT PUTIN SAID COULD HAVE CAUSED A CIVIL WAR, HE SAT DOWN WITH THE MEN THAT HE ACCUSED OF TREASON, SPOKE TO THEM FOR THREE HOURS, AND SUGGESTED THEY GO BACK TO THE FRONT LINE IN UKRAINE. NOW, TOM, YOU REMEMBER LAST WEEK IN BELARUS WE WERE SHOWN TENTS WHERE YEVGENY PRIGOZHIN AND HIS WAGNER FIGHTERS WERE SUPPOSED TO BE. THEY WEREN'T THERE. WE WERE TOLD THEY MAY NEVER COME. I THINK THIS MIGHT BE THE KREMLIN TRYING TO REASSERT CONTROL AND SAY PRESIDENT PUTIN IS IN CHARGE. >> KEIR, A LOT OF MIXED MESSAGES THERE. SO WHAT DOES THIS ALL MEAN? >> Reporter: YEAH. WELL, IT IS CONFUSING. IN THE SOVIET ERA THEY USED TO CALL THIS KREMLINOLOGY. I THINK FOR PRESIDENT PUTIN ONE OF THE CHALLENGES IS WHAT DOES IT LOOK LIKE NOT TO HAVE CRUSHED THIS MUTINY AND THE PEOPLE AROUND IT? IS HE CONCERNED THERE MAY BE SOME KIND OF A BACKLASH? I THINK, TOM, ONE OF THE THINGS WE CAN GLOBE ABOUT THE GROWING ATTACKS THEY'RE FACING. PLUS MADONNA BREAKS HER SILENCE ON HER IN ARTISTS TAKING SAFETY MEASURES INCLUDING PROTECTIVE NETTING AROUND THE STAGE OR EVEN PROHIBITING CELL PHONES. TOM? >> KAYLEE HARTUNG FOR US. >>> AND MADONNA BROKE HER SILENCE FOLLOWING THAT HEALTH SCARE TWO WEEKS AGO THAT LANDED HER IN THE ICU WITH A BACTERIAL INFECTION. THE QUEEN OF POP POSTING ON INSTAGRAM THAT SHE IS ON THE ROAD TO RECOVERY. MADONNA, WHO'S 64, SAYS SHE'S FOCUSED ON GETTING WELL AND GETTING BACK ON STAGE, ANNOUNCING SHE WILL RESCHEDULE THE NORTH AMERICAN LEG OF HER TOUR. >>> OKAY. UP NEXT, IT HAS AS MUCH CAFFEINE AS SIX CANS OF SODA. THE NEW CALLS TO REGULATE PRIME >>> A COUPLE OF SOCIAL MEDIA SUPERSTARS ARE PUSHING AN ENERGY DRINK CRITICS SAY COULD BE DANGEROUS FOR THEIR MILLIONS OF YOUNG FOLLOWERS. IT'S CALLED PRIME, AND IT MAY EVEN BE IN YOUR REFRIGERATOR. NOW ONE OF THE MOST POWERFUL SENATORS IN WASHINGTON IS CALLING TEENAGER SHOULD HAVE 200 MILLIGRAMS OF CAFFEINE? >> A NORMAL TEENAGER SHOULD NOT NEED THAT MUCH CAFFEINE EVER. >> Reporter: DR. MINNOCK SAYS THE RISKS ARE ANXIETY, SLEEP DISRUPTION AND CARDIAC ISSUES. >> CAFFEINE CAN CAUSE HEART PALPITATIONS. IT CAN CAUSE CHEST PAIN. IF A PATIENT PERHAPS HAS AN UNDIAGNOSED CARDIAC ISSUE, IT CAN EXACERBATE THAT. >> Reporter: IN A STATEMENT THE COMPANY SAYS IT COMPLIED WITH ALL FDA GUIDELINES AND WELCOMES DISCUSSIONS WITH THE FDA OR ANY OTHER ORGANIZATION TO PROTECT CONSUMERS. MAKING SURE THE BUZZ IS JUST POPULARITY. ANNE ♪♪ >> ONE OF A KIND. THAT'S "NIGHTLY NEWS" FOR THIS MONDAY. I'M TOM LLAMAS IN NEW