Don't forget Reagan/Carter. Reagan manufactured the October Surprise, making a deal with terrorists to prolonging a hostage situation in Iran, just to tank Carter in the polls.

Yeah, the most scandal-ridden judge was appointed under H.W. Bush. They're not a particularly worthy bunch even aside from shenanigans.

To what degree should prior selections be honored/respected if the presidents in question won under questionable circumstances

It would depend on the circumstances, but it would have to be very unique and extreme circumstances. The goal would be to avoid a Tit for Tat downward spiral to Civil War.

George W. Bush’s election in 2000 and the stopping of the Florida recount,

I believe that the mob that raided the office should not have allowed the vote counting to have been stopped. IMO it gave a green light to whomever set that up to go forward and do something along the lines of January 6th.

Having said that, no I wouldn't for this situation. Almost, but no.

or Donald J. Trump’s election in 2016 after his call for foreign interference, alongside James Comey reopening the investigation into Hillary Clinton just before the election?

No. Simple political interference wouldn't be enough, we're talking about extreme circumstances only.

LOL

I don't know the details, from what I understand FDR was contemplating the same thing, so it does seem like the power to do this is an electoral branch power and not in the legislative branch.

But I honestly don't know the details so I could be wrong, its just something I heard of before.

The problem is that we're at a point where Republicans are not hesitating to lie, cheat, and steal their way to power. They have demonstrated quite clearly that they no longer have an interest in playing fair.

We need Democrats who aren't afraid to fight back or we'll lose our Democracy in America and eventually fall to fascism.

There may not be a good ending here, but it's time to draw a line in the sand.

Probably stops at civil war.

What options are there to fix this active extremist right wing slow motion coup that is trying to overthrow our Constitution by destroying established legal precedent?

This is not a one side versus the other political sport contest, this is far beyond any such sophomoric simpleton bullshit.