Fresh off his vacation, MSNBC's Pat Buchanan came out swinging Tuesday on "Morning Joe," calling former House Speaker Newt Gingrich a "political opportunist" for his comments about the proposed mosque in New York City. On Monday, Gingrich compared the building of a proposed mosque near Ground Zero to Nazis putting up "a sign next to the Holocaust Museum" or "the Japanese putting up a site next to Pearl Harbor." Buchanan argued that Gingrich's controversial comments were meant to position him to the right of his potential GOP primary opponent, Sarah Palin, on the issue. VIDEO HERE