President Biden on Monday said that all Americans must speak up because diversity is being attacked, remarks he made while marking 60 years of the Lawyers’ Committee for Civil Rights Under Law.

The event comes just days after a deadly shooting in Jacksonville, Fla., killed three Black Americans, which is suspected to be racially motivated. The president bashed attacks on diversity such as book bans, which are happening in states including Florida and are targeting books about slavery and Black history, among other topics.

“Now is the time for all Americans to speak up when history’s being erased, books are being banned. Did you ever think we’d have this conversation here, at this time?” Biden said in remarks. “Diversity’s being attacked.”