Donald Trump believes Brad Pitt's refusal to marry Angelina Jolie until gay marriage is legal is a crafty move, insisting it's an excellent way for the Hollywood hunk to stay a bachelor.

The property tycoon reckons Pitt's heart is in the right place, but hints that maybe he has a sneaky motive in refusing to get married.

He says, "Obviously, Brad is trying to be a social activist and make a point. Or at least that's what he wants people to think. "Maybe he's just come up with an excellent way to stay a bachelor. It makes him look really concerned about the plight of other people. Yet at the same time, he doesn't have to get married. This guy is smarter than I thought."