It depends if the GOP maintains a majority in the House or can expand it and if they can recapture the Senate.
There were a lot of Republicans who weren't fans of his in 2016 but certainly were willing to work with him on legislation during his presidency. And as much as people may hate Mitch McConnell, McConnell supported Trump's election in both 2016 and 2020, and stuck by Trump during both of his impeachments.
But my guess now is that McConnell, who is going to be the lead Republican in the Senate until he leaves, would be a lot more likely to give Trump the boot if that were to happen again. And I don't think he's the only Republican whose views on Trump have soured since 2016.
The issue where Trump's toxicity worries me the most is immigration. The actions of DeSantis and Abbott have helped to make the entire country more aware of the problems posed by mass illegal immigration. I think it may well be possible for a Republican President to put together a bipartisan coalition to get a lot more border security.
But I don't think that can happen if that Republican president is Trump, because he is so toxic to Democrats that no Democrat will side with him on major legislation
even if they would otherwise support that legislation, because the rest of their party will crucify them for siding with Trump on
anything.
Trump is literally the worst announced Republican candidate we could have in office if the primary concern is stopping illegal immigration.