Sen. Mitt Romney (R-Utah) on Thursday took aim at former President Trump for pushing Republican lawmakers to oppose a border deal so that he could use the issue to campaign against President Biden in the 2024 presidential election.

Romney told CNN’s Manu Raju he thought it was “really appalling” that Trump would try to prevent progress on addressing the surge in migration at the southern border.

“I think the border is a very important issue for Donald Trump,” Romney said. “And the fact that he would communicate to Republican senators and congresspeople that he doesn’t want us to solve the border problem because he wants to blame Biden for it is really appalling.”