>
>Believe me, I don't have many kind words to say about Christie
>
>And by the way, Trump just played him like a child.

I'm not so sure that the endorsement was exclusively Trump's idea.

http://www.cnn.com/2015/07/31/politics/trump-mob-mafia/index.html

Christie, via Atlantic City, has contacts with many of the same people Trump has.

Some suggestions, incentives and even just cash, might have come from those contacts.