1. He’ll have violated Article I, Section 9 of the Constitution, which prohibits someone in federal office from receiving anything of value from a foreign government. Trump’s far-flung businesses around the world are often owned or part-owned by foreign governments, and he has already done things or said things that will enhance the profits of those businesses. Meanwhile, the Trump organization continues to urge foreign dignitaries to stay at the Trump International Hotel – a clear violation.
2. He'll also have violated the 1967 Anti-Nepotism law prohibits a president from hiring a family member for a public office. Yet Trump is making his son-in-law, Jared Kushner, Senior Advisor to the President. The purpose of the law was to prevent even the appearance that someone holds office because of family ties rather than competence or expertise.
Are these the kind of “high crimes and misdemeanors” that the Constitution finds to be impeachable offenses (Article I, Section 5)? Maybe.
Of course, if the Putin connection reveals Trump to have been involved in stealing the election, he’s almost surely impeached and convicted.
But there’s another way to get rid of Trump: The 25th Amendment to the Constitution gives the Vice President, together with a “majority of either the principal officers of the executive departments or of such other body as Congress may by law provide,” authority to remove the President for being “unable to discharge the powers and duties of his office.”
Trump is nuts. My betting is on the 25th Amendment.