Yea Canada would be the only one to even remotely manage that, and that’s taking the gamble that the US doesn’t launch a nuke before it finishes.

Being said it would need to be the military, I don’t think the average citizen would stop something like that. Especially if the invaders were another democratic leaning country. The only way I think you get civilians to fight is if it ends up being a communist country that tries to invade.

Hell we’re talking a country that basically shrugged and said “oh well they deserved it” when someone shot a healthcare CEO, I can’t see anyone batting much of an eye if someone deposed the sitting officials, especially the head of the country.

Being said though… if something like that did happen, I don’t think it will be from a foreign government, I think it would be domestic. Not that it makes it any better.