South Carolina Rep. Mick Mulvaney, nominated to head the Office of Management and Budget by popular vote loser Donald Trump, told senators at his confirmation hearing Tuesday that Trump's promises to leave Social Security and Medicare are going to be broken.

Mulvaney, R-S.C., developed a reputation in Congress as an eager supporter of deep spending cuts, and in confirmation hearings as President Donald Trump's proposed chief of the Office of Management and Budget, differed with Trump on entitlement spending. "I believe, as a matter of principle, that the debt is a problem that must be addressed sooner, rather than later. I also know that fundamental changes are necessary in the way Washington spends and taxes if we truly want a healthy economy. This must include changing our government's long-term fiscal path, which is unsustainable," Mulvaney said in his opening remarks Tuesday before the Senate Budget Committee.

Here’s Tennessee Sen. Bob Corker, essentially implying Trump didn’t know what he was talking about in the campaign in making his “totally unrealistic” promises that “make no sense whatsoever,” and asking Mulvaney if he’s been able to explain all that to him and that cuts to Social Security and Medicare will have to be made. Mulvaney says “he knew what he was getting when he asked me to fill this role. [...] I like to think that’s why he hired me.” Watch the video below.