Trump's sycophants DON'T CARE what he believes. All they care about is his pissed-offness, his willingness to insult and demean other people, and his constant sloganeering.
Just ask them what he believes about, say, abortion, or healthcare. If they know, they'll be ashamed to repeat it.
Republicans who trash candidates for changing positions will back a man who donates to the Clinton Foundation and, up until the day before yesterday, was an avowed DEMOCRAT.