The director of African-American outreach for Donald Trump's presidential campaign believes her nominee's critics will eat their words come November.

In a new trailer for an upcoming PBS documentary, Omarosa Manigualt predicted that Trump will change the country once he wins, and said his critics will have to "bow down" to him if he wins.

"Donald Trump is running for president because he really, truly believes he can turn the country around," the former contestant on Trump's reality show "The Apprentice" says in the trailer. "More importantly, every critic, every detractor will have to bow down to President Trump."

The documentary, set to air Sept. 27, explores the lives of both Trump and Democratic nominee Hillary Clinton.