D.L. Hughley says Don King's an Idiot For Defending Donald Trump

D.L. Hughley wonders if Don King took more punches than his fighters ... which is the only way he can explain King's defense of Donald Trump.

The comedian was at LAX Sunday when our photog asked him to critique Don's argument that the real issue is our broken system -- not Trump's 10-year-old "locker talk." Check out the vid.

D.L. also had a little somethin' for Bill Cosby.