Tagg Romney

Mitt Romney's son, Tagg, says he had the urge to take a swing at President Obama when the Chief Exec called his dad a liar. Tagg made his comment on a radio show, when asked how it felt to hear Obama accuse his father of fibbing. As for why Tagg resisted ... his first reason -- lots of secret…

TMZ has learned Mitt Romney's son Tagg -- who had twins this year through a surrogate -- signed an agreement that gave the surrogate, as well as Tagg and his wife, the right to abort the fetuses in non-life threatening situations ... and Mitt Romney covered some of the expenses connected with the…