When did the White House know — and exactly who knew — about conversations that Michael T. Flynn, the former national security adviser, had with the Russian ambassador? That was the focus on Monday at a Senate hearing where Sally Q. Yates, the former acting attorney general, testified about Russia’s interference in the presidential election.
James R. Clapper Jr., the former director of national intelligence, also testified, giving senators a chance to go well beyond the Flynn affair and ask about leaks of classified information to the news media; the F.B.I.’s investigation into the Russian interference and possible collusion by Trump