Musk has spent days bounding in and out of meetings, sitting in on phone calls, weighing resumes and traveling to Washington as Trump’s unofficial co-president.

Trump added, "politics is tough and in many cases it’s not a very nice world, but it is a nice world today." "I appreciate very much the transition that's so smooth. It will be as smooth as it can get, and I very much appreciate that," he continued.

Elon Musk, the world’s richest person, will be taking on an official role to try to help President-elect Donald Trump make government more efficient. It will add yet another responsibility to an ever-growing to-do list for the increasingly distracted CEO and business leader.

U.S. President-elect Donald Trump on Tuesday named Elon Musk to a role aimed at creating a more efficient government, handing even more influence to the world's richest man who donated millions of dollars to helping Trump get elected.

President-elect Trump has named Elon Musk and Vivek Ramaswamy to lead a department of government efficiency. NBC News Vaughn Hillyard has more on Trump's latest cabinet picks and the new agency.

U.S. President-elect Donald Trump on Tuesday named Elon Musk and former Republican presidential candidate Vivek Ramaswamy to lead a newly created Department of Government Efficiency, rewarding two of Trump's well known supporters from the private sector.