You don't provide any references for the items you listed. Each statement is meaningless by itself. If there was any truth to any of them, the aforementioned checks and balances are in place to counter them. I'm sure that if you looked for dirty tricks by
any president, you'll find them.
You may not realize this, but amongst the leaders of all the western democracies, the office of POTUS is actually the
weakest, as to control of a national government.
Under the parliamentary system, as practiced in the UK, Canada, Australia, etc, if the governing party holds the majority of seats in parliament, the Prime Minister is a virtual dictator - in theory. But, he is restrained by the rule of law, of course.
For example, if the Prime Minister wants a piece of legislation passed, he can
order all of his MPs to vote in favour. Or, against it, if he so desires. Failing to tow the party line would result in expulsion from the party's caucus. This has happened before - many times.
Of course, he is restricted by the constitution and the courts. Also, if it came down to the PM wanting to impose dictatorial control, or some other drastic legislation, his own party would rebel and vote against him. He would be a lame duck then and unable to exercise control of his party. Plus, each party can conduct a leadership review. If he is found "wanting" in his role as Prime Minister, the party can turf him and elect a new leader, who would become PM, by default.
As I understand it, the POTUS does not exercise the same level of control over his party. Indeed, is it not common to see congressmen/senators vote against their own partys' bills?