So then if any act that a POTUS enacted by executive order is declared unconstitutional by SCOTUS, then COTUS can start impeachment proceedings. He’s violated the Constitution, so has committed an HCAMD. That once again destroys the system of checks and balances, and puts unlimited power in the hands of the legislative branch, at the discretion of the judiciary’s whim. You need a little more than that, I think.
It might work better to say that he’s giving aid and comfort to the enemies of the US by enabling an invasion, but people living far away from the Rio Grande valley will have trouble thinking of their gardeners and landscapers as invaders, even if they do tend to vote excessively often on behalf of dead people.
So while it might work legally, it would be hard to sell politically. Let’s not forget that there were legal grounds to impeach Clinton and remove him from office, but those grounds failed to gain political support, so the entire process ended badly.
0 is giving aid and comfort to the enemies of the US by helping ISIS, the Muslim brotherhood, and the Arab spring.
THAT is a high crime and misdemeanor.