Who is celebrity mogul Donald Trump going to endorse in the Republican presidential nomination contest? The Associated Press reports that Trump plans to endorse former House speaker Newt Gingrich in Las Vegas today. But CNN is reporting that Trump is going to endorse former Massachusetts governor Mitt Romney. Both cite anonymous sources. AP cites a “source close to Gingrich’s campaign.” But the news service also quoted Gingrich saying Wednesday that he had “no idea what the Donald is going to do.” “Trump is the only person who knows what Trump will do,” said Gingrich campaign spokesman R.C. Hammond.