New Jersey Gov. Chris Christie (R) joined NBC's "Late Night with Jimmy Fallon" Wednesday for a musical number that touched on the governor's decision to call an October Senate election and his presidential ambitions.

Christie even engaged in some faux-sparring over jokes about his weight. "Yeah, that's right it hurts. So step off brother," Christie told Fallon.

"Isn't that your bathroom scale says every day?" retorted Fallon.

Check out the complete clip below.