Cassa.....the answer to your question lies in the character of Trump himself.
He is used to making policy up on the run, so to speak. He is also used to be obeyed, and he has little experience of being challenged at any level.
Almost all politicians at a high level, will have come up through the ranks, as it were. They will have vast experience of committees, where cases have to be argued and debated before being adopted.
Trump has none of that experience. He was hoping to hit the ground running last month and he has found, to his cost, that it doesn't work that way !
Although he still doesn't seem to realise that he just can't carry on being impetuous and childish. He keeping digging these holes that he made and he keeps on digging.
What a great time in America to be a lawyer !