mexico plus, nbc s new reporting on how the u.s. will handle thousands of people entering the country she wrote a children s book about grief after her husband died now, the mother of three is accused of poisoning him with fentanyl the new details from a search warrant just in tonight. for the first time, an fda panel endorses over-the-counter birth control pills. when they ll be available. and the new treatment for peanut allergies in the youngest children one step closer tonight. announcer: this is nbc nightly news with lester holt. good evening, and welcome. a republican congressman who was accused of launching a political career built in part on made up claims about his family and work history was arrested today on federal charges. congressman george santos turned himself in to authorities on long island, new york, this morning, where he has been indicted on 13 criminal counts that includes money laundering, theft of public funds, and false statements to con