Anderson Cooper Tells Jeffrey Lord He'd Still Defend Trump if He Pooped on a Desk

Anderson Cooper used a little toilet humor with a well-known supporter of Donald Trump ... saying the guy who probably back the prez dropping a deuce in public.

Cooper was interviewing Jeffrey Lord about Trump's Oval Office convos with Russian diplomats when he interrupted to drop a #2 bomb. Lord's momentarily shocked look was priceless.

Cheap laugh, sure ... but poop jokes always kill. Cooper later apologized, and commended Lord for defending Trump no matter what.