Rand Paul is formally endorsing Sen. Mike Enzi as he faces Liz Cheney in a Wyoming GOP primary next year, Paul told POLITICO in an interview Wednesday.

“I’ve told him I’ll do anything I can to help him,” the Kentucky GOP senator said. “In fact, somebody asked me today if they could use my name, and I said I’d be happy to sign on and do a fundraiser for him.”

Paul said he isn’t sure why Cheney decided to challenge Enzi, but said she might end up picking up some grudges for doing so.

“I don’t think it probably will be helpful in the long run. I’m pretty sure Senator Enzi will be able to hold off against any primary challenge,” Paul said. “In doing so there will be some people that won’t be so happy with the primary challenge, that might bear grudges.”