New Jersey Gov. Chris Christie borrowed a line out of the Democrats' playbook to knock Donald Trump on Thursday.

Trump's campaign slogan, "Make America Great Again," which is emblazoned on his signature trucker hats, prompted the Democratic National Committee to respond with its own memorabilia. The DNC began selling similar hats that read "America Is Already Great." During a town hall in Nashua, N.H., the governor echoed the Democratic Party's barb at Trump.

"I'm not promising to make America great again because America already is great," Christie said. "Government doesn't make America great, the people make America great."

Christie continued to argue that the premise of Trump's campaign slogan is false and said the government "stops us from greatness." The governor said he would not pledge to make America great again, but he promised to be "tough enough" to serve in the White House.

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