In an interview with CNN, New Jersey Governor Chris Christie says billionaire investor Warren Buffett should "just write a check and shut up."

Christie was referring to a proposed tax hike for the rich that Buffett has lent his name to. The so-called "Buffett Rule" would ensure that people making more then $1 million a year pay a higher share of their income in taxes then the middle class.

Christie, who is supporting Mitt Romney for the GOP presidential nomination, is also being mentioned as a possible running mate for the party's eventual nominee.