@wildgrass said
that's not an answer to my question. You say that it could happen, but don't provide any plausible scenario.
Here's the answer to your question: Exhaustive well funded research over decades. A pretty good list of efforts to find cheating and stealing are found here. If cheating and stealing is still happening despite all these investigations and court trials to find it, ...[text shortened]... ttps://www.brennancenter.org/issues/ensure-every-american-can-vote/vote-suppression/myth-voter-fraud
First of all before 2002 we did not allow international election observers.
Russia had international election observers overseeing the referendum and they were accused of cherry picking the election observers that were sympathetic to Russia. How do you know international election observers overseeing US elections are from countries that matter? Are any of them from Iran, North Korea or Venezuela? How are these observers picked?
edit: There were election observers in Venezuela and Carter certified the election.
https://www.commentary.org/ben-cohen/jimmy-carter-gives-seal-of-approval-to-venezuela-election/
Then the USA called Chavez a dictator.
https://www.theguardian.com/world/2010/mar/11/sean-penn-hugo-chavez-venezuela
Conclusion: The US government are election deniers. Everybody who denied the elections in Venezuela would not be able to run. That would be most of government. I actually like the idea of that. LOL
Still unconstitutional though. It will never happen.