Senate Majority Leader Mitch McConnell of Ky., left, meets with Budget Director-nominee Rep. Mick Mulvaney, R-S.C. on Capitol Hill in Washington. Mulvaney, President Donald Trump’s staunchly conservative choice to lead the White House budget office, is headed before the Senate Budget Committee, where panel members will probe for clues on the new administration’s plans for tackling intractable budget deficits.