Seems to be intent on going after the democratic base.
Good luck.
This is what I am thinking. A couple of years ago, the "birthers", of which I consider myself a member, noticed Trump making noises about getting to the bottom of Obama's eligibility. I instantly recognized it as pandering to this minority of hard core conservatives, and my impression of the time was that he is probably angling to run for President and so now he's trying to make friends with some constituents of the Republican base.
I actually didn't think it would work because no one would be dumb enough to fall for a Liberal New York Democrat like him trying to curry favor with some hard core members of the Republican base.
I also think he was doing some racial dog whistling and I surmised he was doing this because he thought that racists made up a significant segment of the Republican base. I surmised he got this idea from living in the social environment of New York where they have always called us racist hatemongers. Trump was acting on the Caricature that he had grown up believing.
All of this dovetails with my belief that he has no fixed ideology in the manner we understand the term. He is a non-political guy who decided to run for President to reach the peak symbol of his life's narcissism. Being President is the ultimate Ego boost for an Ego Junkie like Trump, and he doesn't mind using underhanded tactics to do it.
Thus he waves the rainbow flag once his supporters who would object are already safely in his camp and will not now make trouble over it. He won't lose many for doing it, but he
might gain some from the Democrats by doing it. He personally doesn't care one way or the other and he's just doing it in a cynical effort to win.
He is in fact, a pretty D@mn good politician, and he has insulated himself from being cornered by changing his mind so many times that changing his mind again no longer brings much notice.