The president cited "horrible people" who have made his time in office more difficult for the reasoning behind his answer, specifically naming House Speaker Nancy Pelosi, D-Calif., Senate Minority leader Chuck Schumer, D-N.Y., and Rep. Adam Schiff, D-Calif.
"It's been mean," he said during the interview.
"You deal with people that are very deceptive," Trump said. "They'll go, 'Mr. President, tell me, who is the country that's most difficult to deal with? Is it Russia, is it China, is it North Korea?' ... No, by far the most difficult country to deal with is the U.S. It's not even close."