“I try and eat properly,” the former president told Attkisson, who quickly pointed out how much he likes hamburgers. 

“I do,” Trump admitted. “But proper hamburgers.”

Colbert broke out his Trump impression. 

“Proper hamburgers, not renegade hamburgers, not outlaw hamburgers,” Colbert said. “I only eat the most proper hamburgers. These are hamburgers wearing a necktie, a little top hat, and a sash that says ‘Mayor McCheese.’ How he screams when I bite him.” 

See more in the Monday night Late Show monologue: