And Reagan was one for the longest time until he saw what they were doing. "i didn't leave the democrat party. The democrat party left me."

There's an interesting article about how Trump's biggest political inspiration was actually Ross Perot who ran as an independent.

Realistically his party affiliation (like Ron Paul) is more to get on the ballot than actual affiliation and it just so happens to coincide in ideology more often than not.

He only became a Republican when he realized they were the ones most likely to be stupid enough to vote for him. He said that himself.

And if he continued pretending to be one? (like he pretended to be GOP)
He'd be heralded as the greatest Dem POTUS ever !