Trump is, sad to say, an amateur who is being ground into dust by the professionals.
He is an expert in this "Politics" business, but he is massively outnumbered by the oppositions army of propagandists and their trillion dollar broadcasting infrastructure.
With so many people arrayed against him, it is difficult for anyone, no matter how good they are at politics, (and Trump is actually D@mn good at this business) to maintain an upper hand.
The business of politics and the media's coverage of it requires adherence to an accepted protocol of behavior, and Trump's defying it and the pros are lowering the boom on him.
They are doing what they do, but with greater anger and therefore greater vigor. They *hate* Trump because he wrested Victory from their jaws, and now they are using any means of which they can think to paralyze and attack him.
Trump's tendency to shoot from the hip is not the central problem here. The primary problem is the fact that virtually every avenue by which the American Public can get "News" is controlled by Hyper-Partisan Democrats with an agenda to destroy their political opposition.
Trump has to appeal to the people. He is being confronted by a slow-motion coup, and he has to simultaneously be Presidential and attack the motivations of his adversaries. He needs to fight this civil war, for that is what this is, or step aside.
That part is all correct except for the "step aside" part. That is the worst thing he can do. He needs to make it clear to his opponents that he will fight them till the bitter end, and he will not resign no matter what they do.
Any hint otherwise will convince them that they just need to apply more pressure.