a) That's possible, & perhaps in a Trump 2nd term, likely.... or that some future GOP President doesn't decide to pardon him
b) The U.S. presidential oath of office - ARTICLE 2. SECTION 1. 7
"I do solemnly swear (or affirm) that I will faithfully execute the Office of President of the United States, and will to the best of my Ability, preserve, protect and defend the Constitution of the United States."
c) The U.S. president's role / rank in U.S. federal government - ARTICLE 2. SECTION 2.
1 The President shall be Commander in Chief of the Army and Navy of the United States, and ...
Cause for concern / alarm (though not a surprise) that a U.S. president never to have obtained majority support would be so publicly reckless gamble U.S. sovereignty.
“We fell in love.” President Trump commenting on his relationship w/ NK/KJU