Nate is saying that Rubio, Cruz, Walker etc, should condemn Trump when he becomes the nominee and not let his faction gain legitimacy in the Republican Party.
To which I say, fat fucking chance that matters.
They're better off giving Trump the keys to the bus on fire and starting their own party.
Who is really going to vote for a conservative, non-nationalist party? No one cares about the GOP's non-Trump platform other than the super religious and conservative academics/journalists.
It would basically be:
Nationalists
Democrats
Neocons+Super religious+libertarians+Donors
And the super religious dominate the neocons and libertarians and donors in numbers so it would basically just be a Christian party that wouldn't have much relevance. I care a huge amount about free markets and non-nationalist policies, but no voter in America actually does.