Congressional Republicans are increasing pressure on the administration to produce records related to the latest string of controversies involving President Trump, amid flagging confidence in the White House and a growing sense that scandal is overtaking the presidency.

As the White House sought to contain the damage from two major scandals, leaders of two key Senate committees asked the FBI for documents related to former director James B. Comey, who was leading an investigation into Russian interference in the 2016 election before Trump fired him last week.