Trump's Republican administration alleges the ban violates the Constitution's Second Amendment right to bear arms.
Joining us on Up Close is Frank DeAngelis, who was the principal of Columbine at the time.
Students of Columbine High School have been asked to participate in a day of service rather than join the National Walk Out on April 20.
Watch Eyewitness News coverage of the Columbine High School massacre. On April 20, 1999, two students went on a deadly shooting rampage at the school in Littleton, Colorado.