Rep. Eliot Engel (D.N.Y.), the ranking member on the House Foreign Affairs committee, also called on Flynn to be fired.

Sen. Claire McCaskill (D-Mo.), the ranking member on the Senate Homeland Security and Governmental Affairs committee, sent a letter to FBI Director Jim Comey on Friday requesting a briefing into any investigation into Flynn’s contact with Russia.

The details of Flynn’s conversation last month are the latest in a series of unflattering leaks about him. Last month, people close to Steve Bannon, Trump’s chief strategist, described Flynn to the New York Times as a bad leader. The Times also reported that Trump felt Flynn talked too much, and Trump ordered his team to remove Flynn’s son from the transition team after the younger Flynn tweeted an untrue conspiracy theory.

This story has been updated to include responses from Engel and McCaskill.