The Republican National Convention canceled one of its Tuesday night speakers after she promoted an anti-Semitic conspiracy earlier in the day.

Mary Ann Mendoza, a member of the Trump campaign’s advisory board whose son was a law enforcement officer who was killed in the line of duty by an undocumented worker, encouraged her more than 40,000 followers to read The Protocols of the Elders of Zion on Tuesday, which was first reported by the Daily Beast. The RNC decided not to show her speech in response to her promotion of the conspiracy theory, according to multiple outlets.