Stephen Colbert couldn’t help but make fun of Donald Trump during the Monday, March 4, episode of his talk show, The Late Show with Stephen Colbert. First, Colbert, 59, brought up how Trump, 77, slurred his words during a recent speech, prompting people to become more and more concerned about his mental fitness. “We’re a nation that just recently heard that Saudi Arabia and Russia will re-feh-ur ah [sic],” he said at a recent rally in North Carolina. “Not entirely sure what’s going on there. But apparently he can’t even say the word Russia without climaxing,” Colbert said before he imitated th…