Sen. Elizabeth Warren sent a letter to the Trump administration's top consumer protection official late Thursday asking him whether he is doing the bidding of the industries he is supposed to be policing.

The move was in response to remarks about lobbyists made earlier this week by the acting head of the Consumer Financial Protection Bureau, Mick Mulvaney.

Earlier this week, Mulvaney told a group of bankers and lobbyists that when he was a Republican congressman he would only talk to lobbyists who gave money to his election campaign.