Stone isn’t the only Trump surrogate to tell FRONTLINE that Obama’s mockery that night was a motivating moment in Trump’s journey from flamboyant businessman and reality TV star, to the Republican presidential nomination.

“I thought, ‘Oh, Barack Obama is starting something that I don’t know if he’ll be able to finish,’” says Omarosa Manigault, a former Apprentice contestant who was at the dinner that night, and is now Trump’s director of African-American outreach.

“Every critic, every detractor, will have to bow down to President Trump,” she adds. “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.”