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to tucker carlson tonight. for thousands of years clinical trials have been the center of medicine. the idea is very simple before you operate on someone reject people with some new jug trials first. to make certain that what you're doing will help the patient more than it hurts the patient. this is not a new idea they did back in the 18th century with this famous scurvy trials. five medical testing is been going on since at least biblical times is why wouldn't it. comparative vegetarian diet of the one of the royal babylonians over a ten day period to a control group and event obser...

happening now, breaking news, police officially announce the arrest of a suspect in the killing of four university of idaho students. the 28-year-old is in custody in pennsylvania right now and charged with four counts of first-degree murder. our correspondents are getting additional details on how the suspect was tracked down. >> also tonight, former president trump paid zero in income tax during his final year in office, held foreign bank accounts and claimed huge financial losses. we're breaking down the revelations in trump's tax returns now that a house panel has made them publi...

hello, everyone. at this hour southwest apologizes for a nationwide travel calamity warning passengers it pay take days to solve a giant puzzle of canceled flights. and silence from top republicans raises a big question, will incumbent new york congressman george santos get away with lying to voters about nearly every detail of his life? plus, a supreme court ruling keeps in place a trump era immigration measure and leaves thousands of migrants in limbo. that's what we're watching at this hour. good morning, everyone. i'm amara walker in for kate bolduan. welcome to the seventh day...

ukraine a major focus. good day to you. i'm peter alexander here in washington in for andrea mitchell as she travels back from london. she's en route to new york for the u.n. general assembly. nbc news heard reports a charters flight is in the air from texas and florida heading to the northeast, this as legal action is being considered against governors ron desantis and greg abbott's response to their sending migrants to areas like new york, d.c. and martha's vineyard. we are following the story for us. what do we know about the reports that there may be a plane in the air right no...

deadliest russian attacks since the invasion. at least 40 people killed in a cruise missile strike on an apartment building right in the center of the ukrainian city of dnipro. dozens more are injured or still missing and officials warn the death toll could climb. >> new developments in the classified document scandal looming over the white house. sources tell cnn that additional searches are possible and locations connected to president biden, who sources say is growing increasingly frustrated with the saga. >> we're also following the disaster right now in california, as another ro...