Trump’s biggest victory, however, was within the Republican party. When he won the nomination, many prominent conservatives and Republicans were openly Never Trumpers. When he won the presidency, most Republicans decided to accept him, hoping to mold him into a mainstream conservative. Just two years later, without Steve Bannon and other alleged spin doctors, Trump has shaped the Republican party in his image instead.
Whether the Republican establishment likes it or not – and more and more are actually perfectly happy with it – the Grand Old Party is now Trump’s Party. Their fate is intertwined with his. The old conservative Republican party is dead, for now. The coming two years they will campaign as a radical right party, led by an omnipresent leader, who will define the Republican party for a whole generation of Americans.
https://www.theguardian.com/commentisfree/2018/nov/07/midterms-not-a-bad-night-for-trump