Fox News co-host Brian Kilmeade on Monday worried that liberals in the future would try to tear down memorials to the 9/11 terrorist attacks, much as they’ve been targeting memorials to Confederate generals who fought to secede from the United States for the right to keep black people enslaved.

During an interview with Secretary of the Interior Ryan Zinke, Kilmeade asked if he had any concern about the future security of the Flight 93 National Monument, which he suggested could become a target for activists in the same way that statues of Confederate Generals Robert E. Lee and Stonewall Jackson have become targets.