Seven big Michigan donors have said they’re dedicated to ousting the two-term Western Michigan congressman, who’s facing a 2014 GOP primary from businessman Brian Ellis. J.C. Huizenga and Mike Jandernoa are among those raising money for the cause.

The Republican heavy-hitters signed a letter obtained by The Hill claiming that Amash “and others have effectively nullified the Republican majority in the U.S. House.”

The libertarian-leaning Amash has inflamed the GOP leadership and some business leaders because he can’t be controlled.

He’s refused to toe the party line on civil liberties issues. He’s not afraid to blast warrantless wiretapping (something many Democrats won’t do) or vote present on Planned Parenthood funding, despite being pro-life.