A Clemson University professor has declared all Republicans and supporters of Donald Trump to be nothing less than “racist scum” in a bile-filled series of public posts on Facebook. The professor also called for political violence “against white supremacy.”

Bart Knijnenburg, an assistant professor in Human-Centered Computing for Clemson University, expressed his hatred towards Republicans and doubled down when others in his Facebook timeline asked him to clarify his statements, which have since been hidden.

In a report published Wednesday, Campus Reform captured screenshots of his tirade before he made his Facebook account private.