Embattled Environmental Protection Agency chief Scott Pruitt believes members of the administration are actively trying to get rid of him, two sources with knowledge of the situation tell CNN. The mounting acrimony spurred Pruitt’s to reject offers from the White House to help him prepare for his expected grilling on Capitol Hill Thursday.

Pruitt and his staff have blamed the White House, in part, for several of the leaks of damaging information about him. In recent days, they rejected offers from the White House press shop to prepare for his hearings because they don’t think the staff can be trusted not to leak information about the prep session.

Pruitt was incredibly frustrated, one source said, after Bloomberg reported that White House officials were advising Republicans to temper their support of Pruitt.