Gov. Chris Christie made his triumphant return to the debate main stage last night.

Jeb Bush, Chris Christie and Rand Paul participate in the CNN presidential debate in Las Vegas, Nevada. (Photo by Justin Sullivan/Getty Images)

As the campaign tone shifts to terrorism and national security, the debate hit right into Christie's wheelhouse.

Christie touted his background as the U.S. Attorney after 9/11, his expertise in dealing with these national security issues, and having to make tough decisions as Governor of New Jersey.

He criticized the senators running from lacking that type of experience.