In response to the announcement, Mulvaney tweeted: “This is a tremendous honor. I look forward to working with the President and the entire team. It’s going to be a great 2019!”However, in a 2016 video surfaced by the Daily Beast, Mulvaney called Trump a “terrible human being,” just days before the presidential election.“Yes, I am supporting Donald Trump,” then-congressman Mulvaney said during a debate in South Carolina. “I’m doing so as enthusiastically as I can given the fact that I think he’s a terrible human being. But the choice on the other side is just as bad.”Trump made the chief of staff announcement via Twitter on Friday.