In footage of the incident at the Big Ideas Forum hosted by MoveOn, the male protester is seen entering the stage just as Harris took a question about the gender pay gap in the United States before being stopped by Karine Jean-Pierre, MoveOn’s chief public affairs officer.

The protester, named Aidan Cook, said he wanted ask for Harris’ attention on “a much bigger idea” before he was removed from the stage by security. Harris continued speaking after his removal.

Direct Action Everywhere (DxE), an animal rights organization based in California, said in a statement that the man was an activist who wanted to call on Harris “to support ordinary citizens rescuing animals rather than the factory farms that abuse animals.”