Rep. Maxine Waters, D-Calif., called Housing and Urban Development Secretary Ben Carson "an educated fool," during a Congressional Black Caucus Foundation event on Thursday.

"Look at Ben Carson. My God. My grandmother would call him an educated fool," Waters told attendees at the Congressional Black Caucus Foundation Town Hall on Civil Rights in Washington, D.C., Thursday morning.

"Here's a man who has a reputation of being a highly competent surgeon, but when he talks about poor people, he says they're the cause of their poverty. He doesn't understand why you didn't do what he did and why you didn't make it like he made it. And he doesn't know the difference between slavery and immigration," Waters added.

The ranking Democrat on the House Committee on Financial Services warned Carson will be in for an intense experience when he testifies before the committee in coming weeks.

"He's coming before my committee. If you think I took Mnuchin on, you watch what I'm going to do to Ben Carson," Waters said, referring to her debate with Treasury Secretary Steven Mnuchin.