Sen. Tommy Tuberville’s spokesperson asked anti-abortion groups to “make clear” GOP senators risk primary challenges if they support an effort to overcome his military holds over a Pentagon abortion policy, according to an email obtained by POLITICO.

The email, written by Tuberville’s communications director Steven Stafford from his Senate email address, made clear that the Alabama Republican’s staff is worried that at least nine Republicans might join with Democrats to pass a resolution that would allow the Senate to bypass Tuberville’s holds. It was sent on Oct. 26, after news broke that senators were going to release a resolution that would allow the Senate to more easily stop Tuberville’s holds on more than 300 nominees up for military promotions.