People say that, but the sight of say Russian/Mexican/Chinese/Canadian troops parachuting onto the whitehouse lawn to abduct a sitting president, no doubt killing many in the process, would be such an afront that domestic politics wouldnt matter.
This already happened. Trump lead a Russia-backed coup against the United States in January, 2021 to overturn the 2020 election and illegally take the presidency. It failed, but he and every government employee who supported him after that is guilty of treason and is serving illegitimately.
Trump is president because he was elected by the American voter while the opposition was in power. I would not label that as illegitimate and I think it is dangerous to spread that narrative.
Trump lead a coup against the US, is guilty of treason, and is ineligible for public office. I agree it is dangerous to have a traitor to the US in the presidency.
A lack of prosecution does not imply innocence. There were several attempts to go after him for it, but the courts are intentionally set up to favor the wealthy and powerful, in this case via infinite delay tactics. I still think it could've been done and I'll never forgive the Biden DOJ for delaying forever and letting him skate. He should've been in jail by February, serving his sentence by summer.