As much as I don't doubt Trump might try things to stay in power in November and the GOP would be happy to support that (to a point), I really dont think he'd be able to get anywhere if going for a third term. If Trump wants to fight for a third term (physically or through constitutional change), he'll have to have the support of the GOP leadership and they won't give it. Despite Trump's influence in the party, there is an enormous reputational risk, as there won't be more than 20% of Americans (high estimate) that'll support this. I agree that the GOP leadership likely sees Trump as a useful idiot, so instead of supporting him through such madness, they'd rather find another useful idiots - if only in Trump's own family, if that's what it takes to.keep Trump on side.