A see-saw is a lever, it’s middle is placed on a fulcrum.

President Trump is said to be childish. That works in negotiations.

He remembers the principles of leverage and how they can work in his favor.

With all the liberal hysteria about trade war he’s started and the Rachel Maddow and the like’s her nonsensical claims against what he is doing they overlooked this:

European leaders ‘scared to death’ Trump will pull US troops home, ex-defense chief says

Europe is not going to allow that, thus they will give Trump what he wants so that Europe stops taking advantage of us.

Leverage.