Whatever detente Gov. Chris Christie and Donald Trump had appears to be over.

Donald Trump speaks with Chris Christie during a break at the the CNBC Republican Presidential Debate in Boulder, Colorado. (Photo by Justin Sullivan/Getty Images)

Trump unloaded on Christie saying he knew all about the lane closings that prompted Bridgegate.

Then Trump hit Christie for nine credit downgrades in New Jersey, and for his embrace of President Obama after Hurricane Sandy.

Christie and Trump have largely avoided taking jabs at each other.

Trump said Christie threw the first punch and he had to hit back.

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