Donald to Fallon Here's Why I Never Apologize ...

9/12/2015 7:02 AM PDT

Donald Trump to Jimmy Fallon -- Here's Why I Never Apologize ... (VIDEO)

Donald Trump did it again ... delivering the line of the day Friday on Jimmy Fallon's show.

Jimmy threw a clever question at the leader of the pack ... has Donald ever apologized for ANYTHING ... even when he was "little Donny Trump."

His answer ... classic D.T.