New reports of recent speeches at an annual conference held by a right-wing extremist who has espoused white supremacist and Islamophobic views provide the latest evidence that Florida’s Republican gubernatorial nominee, Rep. Ron DeSantis, has supported racist groups and associated with their viewpoints in the recent past.

The congressman, who announced Monday he was resigning from his seat to campaign full time against Democrat Andrew Gillum—the Sen. Bernie Sanders (I-Vt.)-backed, African American mayor of Tallahassee—spoke four times in the last five years at the annual conferences of the David Horowitz Freedom Center.

The group’s namesake and leader is the author of a book entitled “Black Skin Privilege and the American Dream,” which promotes the notion that white Americans are the victims of a race war. He also wrote on Twitter just last month that “Black Africans enslaved black Africans” while “America freed them sacrificing 350,000 mainly white Union lives.”

His organization is dedicated to defending “free societies which are under attack from enemies within and without, both secular and religious” and exposing the “over-arching sinister agendas” of progressive politicians and groups including Sens. Sanders and Elizabeth Warren (D-Mass.) and Planned Parenthood.

Other speakers at recent meetings of Horowitz’s group include multiculturalism critic Douglas Murray, who spoke about Europe’s “civilizational suicide” through broadening immigration; former Breitbart editor Milo Yiannopoulos; and right-wing activist James O’Keefe, who became infamous for producing deceptive propaganda videos regarding Planned Parenthood and protesters at President Donald Trump’s inauguration.