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The bigger danger for Trump is that he will be ignored and these members will coast to re-election (as most incumbents usually do anyway), and that will show how little influence he has in his own party. Trump also misunderstands the House members he is trying to bully if he thinks that going after them publicly like this will make them “get on the team.” Trying to intimidate the members into falling in line will more likely make them less cooperative, because many of them will take as a test of conviction. Beyond that, it will allow them to separate themselves from Trump in the eyes of their voters. That might make some of them vulnerable to a primary challenge, but at this point distance from Trump will help many of them in a general election.
Trump operates as if he were well-liked and held in high esteem by most Americans. That is not the case. If he and his agenda had broad popular backing, it might be politically dangerous for members of Congress to be seen resisting him, but they don’t and it isn’t.