Mitt Romney's Son I Wanted to CLOCK The Prez

10/18/2012 6:27 AM PDT BY TMZ STAFF
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 service around. Tagg went on to say ... accusations of lying are all part of the political process.

No word on what Sasha wanted to do to Mitt.