I think Donald Trump is more like David or Joshua than Samson. For one thing, he is much more wise than Samson and I don’t think the Philistines are going to take him down with their underhanded tricks.
It's not about his wisdom, its about the history of his sexual mores and his manner of speaking.
We have had people who have been claiming that God only uses people who are already pure.
God uses whom he pleases. He calls Prostitutes. Murderers. Brawlers. And then he raises them up to fulfill his purpose.
Billy Graham saw something in Donald Trump and spent the last few years of his life mentoring him. I suspect that there was a reason and I do not believe for an instant that Trump has walked through all of the snares the combined forces of Congress, the intelligence services, and some of the law enforcement agencies lay while he was still a primary candidate due to his own wisdom.