A former U.K. ambassador to the U.S. said on Sunday that Democrats could adopt some aspects of Trumpism after President Donald Trump leaves office.

Peter Westmacott, who was the U.K. ambassador to the U.S. from 2012 to 2016, discussed how Trump and his "America First" agenda have impacted American politics on Times Radio. Westmacott argued that future Democratic leaders could resemble some aspects of Trump because the "mood" in America has changed.

"Trump is part of a mood of at least half of America," Wesmacott said. "70 million people voted for him, and a number of the things that he is doing now, including on trade policy and protectionism and a little bit of that America First stuff, may well be continued by a Democratic successor if indeed there is one."

"In many ways, the mood in America has changed," he added. "It's not universally Trumpian at all. There's a great deal of despair and concern amongst people who are worried about what they see. But I think it is a different America now that we're having to deal with."