It was the latest in a string of recent presidential rebukes to the GOP nominee. Obama hit out at Trump just two days after branding him unfit to be commander in chief from the podium in the White House’s East Room. His intervention underscored the unusually prominent role the current occupant of the Oval Office is playing in the election to decide his successor as he tries to ensure that Democrat Hillary Clinton wins in November.

Obama did say, however, that should Trump beat Clinton, he would fulfill his duty to help the incoming president despite his criticisms of the billionaire’s fitness for the Oval Office.

“If somebody wins the election and they are president, then my responsibility is to peacefully transfer power to that individual. And do everything I can to help them succeed,” he said.