Republican political shills will follow whomever they are paid to follow. The deep pocket benefactors of Republican operatives did not originally want Trump, but once they realized thay his brand of chaos suited their needs, they put out the word to fully back him. It was then that we saw Senators McConnell and Grahm switch on a dime from never Trump to he’s our guy.
The more unworkable the government, the beter corporate America likes it. Thus Trump’s brand of populism is given the green light by the powers to be.