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he does not understand the issues
No he doesn't. But he applied for the job and claimed that he did.
Not many congressmen fell for his line but enough voters did to put him in office. The assumption that any Republican is better than any Democrat and, in particular, even Donald Trump is better than Hillary Clinton won the election for them. But now they have to govern.

Maybe Trump is a big old softy who wants all the little people to love him, but he is a firm believer in Voodoo economics. His route to making the working class happy is by making their corporate employers more wealthy. This is the same ideology that Republicans follow. So in that light they are on the same page.

Good coffee, good weed, and time on my hands...