This is how desperate Donald Trump is to change the news cycle. Trump has had Christies endorsement in his back pocket the whole time. He could have released this whenever he wanted to. He did it today to try to divert attention from the fact that he got his face stomped in by Rubio in last nights debate, and that the face stomping is still continuing today. Clearly, he is desperate to remind people that Christie once got the better of Rubio in a debate.
The optics of this arent looking as good for Trump as he thinks, though. Hes basically admitting, with this move, that he is not able to deal with Rubio himself. He definitely looks like hes running and hiding behind Christies skirt. And in case you were wondering, Donald Trump no, Chris Christie cannot debate Rubio for you next tim