His acknowledgement (or lack thereof) has no legal power whatsoever. He has no actual control over the elections, despite what he might try to lead people to believe. He might try to pull something he thinks is clever, but the electoral system is decentralized and all the crazy shit he tries to pull in court fails. People are so pissed off and fed up with his bullshit that any gains he might make via legally questionable tactics will likely be completely overwhelmed by a tsunami of furious voters.

So, to answer your question: Pretty damn low in my opinion. I expect a bunch of bullshit, but I also expect it will ultimately amount to nothing and these guys are gonna get their asses handed to them in the upcoming election. If extremists tried anything like a revolt, it would be completely doomed from the get-go and they would be absolutely turbo-fucked if things got genuinely violent: The public's patience with this administration is already at an all time low.