I wouldn't be too worried about this fall. Trump can piss and moan performatively all he wants about who does and doesn't get elected to other offices, but it's not like he cares about Congress anymore. Anything he wants to do these days, he'll just sign an executive order, and I don't expect that to change. But for the same reason, I don't see him willingly giving up the Presidency while he still lives and breathes. In 2020 he could just run a normal campaign and arrogantly assume he couldn't possibly lose. In 2028 he is mandated to step down and let another Republican run, and I just can't see him doing that. Can you? Look me in the avatar and tell me you can see him doing that.