Conservatives should “fight back” against the alt-right and white nationalists, and do a better job reclaiming classic terms to stamp out identity politics, House Speaker Paul Ryan (R-Wis.) said on Thursday.

“We have to go back and fight for our ground and re-win these ideas and marginalize these guys the best we can to the corners,” Ryan said. “Do everything you can to defeat it.”

Ryan made the comments in conversation with National Review senior editor Jonah Goldberg. The two conservatives spoke at an event hosted by the American Enterprise Institute. Ryan had harsh words for the alt-right, an umbrella term for extreme right-wing individuals who reject mainstream conservatism and often embrace racism and white supremacy.

“That is not conservatism. That is racism. That is nationalism. That is not what we believe in. That is not the founding vision, that is not the founders’ creed,” Ryan said.