Billionaire Elon Musk spoke at a Republican retreat hosted by House Minority Leader Kevin McCarthy (R-Calif.) in Wyoming on Tuesday.

The event came on the same day that Rep. Liz Cheney (R-Wyo.), the former No. 3 House Republican, lost a primary challenge to Harriet Hageman, who was supported by former President Trump and McCarthy.

A source familiar with the retreat confirmed Musk’s attendance at the event, which included Republican candidates and supporters.