(iii) Proposed provisions specifying that the USPS shall not transmit mail-in or absentee ballots from any individual unless those individuals have been enrolled on a State-specific list described in subsection (b)(iv) of this section with the USPS pursuant to this subsection.



Nixon could not have been convicted without Republican votes. But Nixon resigned, because he knew Republicans would vote to impeach and convict him. So the system can in theory work, even if the system depends on policing its own.
It is in fact quite normal across democracies, for stuff like this to depend on the votes of the party in power.
The problem here is that Republican representatives are traitors to their oaths. And more importantly, that Republican voters are not demanding their representatives to not be traitors.
So Republican representatives simply know that they only get reelected if they act tribally Republican. Note that this is generally not a problem with Democrat voters.
Nixon had to be charged with crimes and serve prison time for the system to have worked. As usual politicians get that magical get out of jail card when the exact opposite should be happening. They should be held to much higher standards and punishments.
Ford pardoned Nixon, and Ford lost the next election. And the pardon probably played a part in Ford losing. So the system still sorta worked then, if imperfect.
Nixon was never officially charged with any crime. The modern day pardon is an extremely corrupt practice as evidenced by the current administration. It should be removed entirely honestly.
If it is allowed it should be the responsibility of a non-partisan committee. The president could refer someone but should have zero power over it. I think it would still be abused, but at least there could be some checks and balances.
Ironically, it turns into a problem for Democrat voters.