A US President is analogous to a company's CEO. The JOB of a CEO is not to make policy decisions. That job belongs to the owners of the company, ie, the shareholders through their elected representatives, the Board of Directors. The CEO's primary responsibility is to IMPLEMENT the decisions of the BOD. Similarly, the President’s job is to implement, NOT DICTATE, the policies of the United States. It is the job of the owners/citizens to determine those policies through their elected representatives, Members of Congress.
Trump is aspiring to usurp the power of the People’s representatives and if Republicans allow it, he will succeed. The answer? Pass ALL funding for the government, let the President veto those bills and then Congress can override his vetoes with a 2/3’s vote.