The chairman of the Senate Homeland Security and Governmental Affairs Committee is demanding that FBI Director James Comey explain what appears to be conflicting information about how the bureau monitored and responded to a terrorist attack in Garland, Texas in 2015.

On May 3 of that year, two men, Elton Simpson and Nadir Hamid Soofi, attacked people at an event where people were drawing cartoons of the Prophet Mohammed. It was the first attack on U.S. soil for which the Islamic State claimed responsibility.