O.J. Simpson has great memories of hanging out with Donald Trump -- who he calls a "fun guy" -- but he's got a warning for him ... messing with Roger Stone might get ya impeached.
The ex-con-turned-political pundit, was in Las Vegas today when a photog asked him about the President's State of the Union address. Simpson seemed wistful about his days partying with his "buddy," but suggests Trump's totally changed now that he's POTUS.
Then, the topic turned to impeachment .