As we know from extensive experience, Trump likes to keep his options open as long as possible. He rarely commits to a course of action until he absolutely has to, and even his apparently final positions can change very quickly. He believes this unpredictability is an asset in dealing with foreign leaders.
But what about Congress? How do Thune and Johnson deal with a man who can pull the rug out from under them at a moment’s notice? How do the Republicans move legislation through the system when they don’t know what the man in charge really wants?
They will find that Trump has very few fixed ideas about domestic policy other than the need to punish his enemies and the desire to be the center of attention. Their best course of action is to do what they think is right and let the man on golf cart take the credit for it if it succeeds.