Americans have given bullshit like this oxygen but we don't have to allow that up here.
If someone alleges election irregularities they better come armed with fucking facts - if they don't we must not tolerate them.
How to avoid tolerating them is the hard part - in the 90s or 00s the penalty for a false claim like this would be ostracization by the voting base, but if the voting base has been fed ends-justify-the-means bullshit like Fox News spreads we may need to rely on some independent process for barring candidates and that can get fucking dangerous.