Trump's budget director convinced him to cut key program because 'he didn't know' what it did

President Donald Trump's proposed budget contained a lot of cuts to key programs that help Trump's own voters, such as the Appalachian Regional Commission that has been responsible for helping slash high poverty rates in rural America.

In an interview with CNBC's John Harwood, White House budget director Mick Mulvaney said that he was able to convince Trump to slash the Appalachian Regional Commission and similar programs in his proposed budget because he had no idea what the program did.

"My guess is he probably didn't know what the Appalachian Regional Commission did," Mulvaney said of Trump. "I was able to convince him, 'Mr. President, this is not an efficient use of the taxpayer dollars. This is not the best way to help the people in West Virginia.' He goes, 'Okay, that's great. Is there a way to get those folks the money in a more efficient way?' And the answer is yes. And that's what's we're going focus on doing."

Harwood then asked Mulvaney if Trump was aware that his budget cuts might hurt his own voters -- and Mulvaney responded that the best way to help all voters was to spur higher economic growth.

"I think what the president will tell you is, 'The best thing I can do for those folks, whether or not they voted for me, is to figure out a way to get 3.5 percent economic growth,'" he said.

Elsewhere in the interview, Mulvaney said he's working on getting Trump on board with making some changes to Social Security, including the disability benefits program, which he said has "become effectively a long-term unemployment, permanent unemployment program."