The White House's Office of Management and Budget will investigate Environmental Protection Agency chief Scott Pruitt's spending.

Director Mick Mulvaney told members of Congress about the investigation Wednesday.

Specifically, Mulvaney said his office would look into Pruitt's $43,000 soundproof phone booth.

Pruitt used agency money for the booth without telling Congress.

That violates the Antideficiency Act, which could, in theory, end with Pruitt being charged with a crime.

Pruitt is under  multiple investigations  for his spending, which includes a large, round-the-clock security team, first-class travel and large raises for two of his senior staffers.

EPA officials have argued the privacy booth was necessary for Pruitt's work.