PBS’s “Frontline” on Tuesday presents “The Choice 2016,” its quadrennial profile of the two major party presidential contenders, and the latest one may surprise viewers who think they know everything that there is to know about Donald Trump and Hillary Clinton.

Omarosa Manigault, a contestant on “The Apprentice” who is director of African-American outreach for Trump’s campaign, explains what she sees as Trump’s motivations for running for president. Among them: resentments.

“Every critic, every detractor, will have to bow down to President Trump,” she says. “It’s everyone who’s ever doubted Donald, whoever disagreed, whoever challenged him — it is the ultimate revenge to become the most powerful man in the universe.”

Specifically, she is referring to the 2011 White House Correspondents’ Association Dinner, in which President Barack Obama mocked Trump, then in the midst of his “birther” campaign and considering a run for the presidency.

“The Choice 2016” is an unvarnished look at Trump and Clinton — relying on extensive archival footage, interviews with friends and biographers, and a brisk style of storytelling. It’s director, Michael Kirk, was a guest on Variety‘s “PopPolitics” on Thursday, and his interview is here.

Here’s a clip from “The Choice.”