A good analysis, but you’re forgetting something. He won’t have to cut a deal - there’s a very decent chance we’re going to have solid majorities in the House and Senate. I think the amnesty lobby is going to have a much harder job come January.
If Trump wins, Congress will fall all over themselves to get tough on illegal immigration.
I think that it is extraordinarily unlikely that we're going to have a "solid majority" in the Senate. I think we'll be lucky to hold on to the Senate at all because the numbers are horrible.
We currently have a 54-46 advantage, but only ten Democrat seats are up this election, and 24 Republican seats are up. It's all the tea party seats from the off-year election in 2010 when Republicans had a huge turnout advantage. The GOP never gets that big a turnout advantage in non-off years. The 24-10 numbers game alone means we're almost guaranteed to lose seats. I don't think I've seen a single projection that we increase or even hold on to our margin. It's going to shrink, and the only question is by how much.
Plus, it looks like our nominee is the guy who is running against incumbents and established Republicans. So if Trump is fortunate enough to convince people to "get rid of all those career pols/throw the bums out", and win, that same PO'd, anti-establishment electorate is likely to give the boot to incumbents. And since it is 24 Republican seats up and only 10 Democrats, an anti-incumbent/anti-politician mood benefits the Democrat attempt to reclaim the Senate.
Anyway, I think it most likely that either the Democrats win actual control of the Senate, or the GOP control is razor thin and dependent upon some moderates. That'll mean there won't be anything close to a filibuster-proof majority. And I think those moderates are going to run in terror from Trump's comparatively extreme immigration agenda.