Republican Rep. Mick Mulvaney of South Carolina is slated to testify on Capitol Hill on Tuesday in his confirmation hearing to become the nation’s budget director, likely facing questions about how President Trump’s promise of big tax cuts and public works projects fits with his own hand-line stance on government spending. Mulvaney, who will appear before the Senate budget committee, would bring a stridently hawkish voice to the Office of Management and Budget in an administration that is disproportionately made up of business executives with little to no experience in government.