Republican Senator Richard Burr of North Carolina stepped down Thursday as the chair of the Senate Intelligence Committee, one day after FBI agents serving a search warrant seized his cellphone. Burr is under scrutiny for a series of stock sales he made after he received privileged briefings about the threat of the coronavirus. Senator Burr’s brother-in-law, Gerald Fauth, also dumped tens of thousands of dollars’ worth of stocks on the same day in February that Burr unloaded a large number of shares. Georgia Republican Senator Kelly Loeffler said Thursday she’s turned over documents to the Justice Department, the Securities and Exchange Commission and the Senate Ethics Committee. Loeffler and her husband, Jeffrey Sprecher, who’s chair of the New York Stock Exchange, traded massive volumes of stocks after a Senate coronavirus briefing in March. Meanwhile, Senator Dianne Feinstein’s office has confirmed the California Democrat was questioned by the FBI over stock trades that her husband, Richard Blum, made ahead of the market crash earlier this year. Feinstein is the ranking Democrat on the Senate Intelligence Committee.