Republican presidential candidate Newt Gingrich says he was vastly closer to President Ronald Reagan than his opponents.

Gingrich says he worked with Reagan when he was in Congress and is proud to have the endorsement of Michael Reagan, Ronald Reagan's oldest son. Gingrich also says that he was "fighting in the trenches" while Reagan was president.

The former House speaker is contrasting himself with rival Mitt Romney, who he says was voting in a Democratic primary while Gingrich worked with Reagan.

Romney says he's always voted for Republicans when he could, though he voted when he was an independent in a Democratic primary. He says it's reasonable to say that Gingrich was closer to Reagan because Gingrich was in Congress while Reagan was president.