The History of the Presidential Campaign for Donald Trump

"I worry about things that I can control, right? And that's the mechanics and the campaign side of things," he says. "You know how it is at the end of every cycle, midterm or presidential, there's just a state of depression in the party." The former Republican National Committee chairman has been working with Donald Trump for more than two years. He was first hired by then-candidate Barack Obama to help run his 2016 re-election campaign.