Cleveland Cavaliers Visit White House

President Obama just got to flex his comedy skills one last time ... welcoming the NBA champion Cleveland Cavaliers to the White House.

LeBron James, Kyrie Irving and the rest of the squad were honored by POTUS on the lawn of 1600 Pennsylvania Ave ... and the prez was funny!!

Topics Obama didn't touch? Donald Trump. Khloe Kardashian. Everything else was fair game ... including busting on J.R. Smith for not wearing a shirt after the Cavs won the title.

B.O. also discusses "MacGyver" Iman Shumpert for delivering his baby with the help of a pair of headphones.

Check out the clip, and congrats champs!