NAACP President Derrick Johnson said in a sharply worded statement that Trump’s attendance would be an “affront” to the movement commemorated by the museum.

“President Trump’s statements and policies regarding the protection and enforcement of civil rights have been abysmal, and his attendance is an affront to the veterans of the civil rights movement,” Johnson said. “He has created a commission to reinforce voter suppression, refused to denounce white supremacists, and overall, has created a racially hostile climate in this nation.”

Some civil rights leaders and black ministers have said they will protest the president’s visit to the museum.