Foreign Policy wondered, for instance, "Does Trump want a 19th-century foreign policy?" He doesn't know. 

And so on. He has no precondition on anything except "I have to be the winner." And the "base" has to agree with it, which makes it quite a bit more complicated.

The whole episode left congressional leaders puzzled: Why, they wondered, would the president tweet something negative about their legislation and rattle Republican lawmakers without ever raising concerns with them — and then act as if nothing had happened?