Sam Clovis, who takes on the role of new national campaign co-chairman said he met with Trump, who it's claimed he previously described as "a cancer on conservatism," but came away confident with his move.
"I don't know all the positions that Donald Trump has, but I do know this: I trust him to do what he says he's going to do, and if we get him to Washington, D.C., that politics in America will be changed forever," Clovis said.
"This takes a lot of courage to step out there and do this. You know you're going to catch hell. And people have been vicious and mean and absolutely scurrilous in their attacks over the last 24 hours," he said. "I wouldn't be on his team if I didn't believe he was the right guy."
"I don't think you can use the word 'conventional' with the Donald Trump campaign.
"It's one of the reasons a lot of us are attracted to him," added Mr Cloves.
Trump's latest advisor to join the team also rejected claims that the billionaire won't take advice.
"He'll listen. I know he does because I have talked to him and I've seen him in small groups... He is a man of his own mind but he wants input," added Mr Cloves.
Last week Trump compared himself to evangelist Billy Graham as he addressed the largest crowd of his presidential campaign.
"I know how Billy Graham felt" Trump joked as he addressed the half-full 40,000-seat Ladd-Peebles Stadium in Washington, Alabama when he began his speech.
