Ms. Omar was sprayed with liquid from a syringe as she spoke at a town hall and called for the resignation of Kristi Noem, who leads the Homeland Security Department.

© Victor J. Blue for The New York Times

Ms. Omar was sprayed with liquid from a syringe as she spoke at a town hall and called for the resignation of Kristi Noem, who leads the Homeland Security Department.

© Victor J. Blue for The New York Times