WH clarifies Mulvaney and OMB. @PressSec says Mulvaney "will not resign" from OMB, "but will spend all of his time devoted to his role" as Acting WH Chief of Staff. She says OMB Deputy Dir Russ Vought will handle day to day operations and run OMB.

— Mark Knoller (@markknoller) December 15, 2018