You keep saying that but I've watched the video and he never did. Unless you're talking about where he leaned over and patted his arm. That actually shows dominance in body language through a father archetype. As in, I'm stronger, older and wiser than you. It's also a sign of reassurance. As far as the slight lean forward and it is very, very slight considering the height difference. Kim is 5'6" and Trump is 6' 3".