He had infiltrated the DNC for a long time now. He knows them and even has a rapport with them. But the GOP was his agenda all along.
CRUZ NEEDS 87% OF REMAINING DELEGATES...
http://www.nytimes.com/interactive/2016/03/16/upshot/trump-cruz-kasich-republican-delegate-lead.html
See:
http://www.freerepublic.com/focus/news/3387449/posts?page=108#108
Trump and his father were national fundraisers for Reagan.
But he both had to get along in 5-1 Democrat Manhattan where he lived and did a lot of his building, and he was rightly put off by the Bush’s international adventurism.
IMO like Reagan he would toughen up our stance abroad while also pulling back from wasting so many American military lives and limbs.