This is how fast things go now and there is no defence possible for the victim. Our system says innocent until proven guilty but with social media you are charged, tried, and convicted within minutes. Truth is irrelevant, facts are not necessary, and due process is a quaint old fashion idea that just gets in the way.
He should step down to avoid trying to lead a political party in an election and going through an investigation on these charges at the same time. If it wasn’t near an election, step down, have an interim leader, and resume if you are cleared of any wrong doings but time doesn’t allow for this. He should be allowed to run for the Ontario PC Party if the members in that riding want him to be their candidate.
With the Federalist Party the party’s Congress can bar a person from running but not the Party Leader.