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.

US President-elect Donald Trump has picked Elon Musk for a role in government cost-cutting, as part of his drive to "dismantle" bureaucracy when he returns to the White House next year. Tech billionaire Musk,

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 Donald Trump on Tuesday night announced Elon Musk will help lead an effort to cut government regulations and slash spending, making good on a campaign pledge to put the Texas billionaire who spent $119 million to get him elected in charge of the so-called “Department of Government Efficiency.

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.