A number of prominent Republicans are vowing to never back Donald Trump even as he closes in on the GOP presidential nomination.

The “Never Trump” ranks include lawmakers, party operatives, pundits and GOP donors — and the movement even sparked a popular hashtag on social media.

They are convinced Trump as standard-bearer would lead the GOP to a devastating defeat in November, costing the party the Senate and potentially the House.

The real estate mogul, though, is marching ahead, and now has 994 of the 1,237 delegates needed to capture the nomination, according to the Associated Press.

And there are growing signs many in the GOP establishment are warming to Trump. He’s been endorsed by 11 lawmakers, with others regularly attending Capitol Hill meetings with his staff. Trump has also declared himself the “presumptive nominee.”