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UNITED STATES - APRIL 20: Students march to the Capitol on Pennsylvania Avenue to call on Congress to act on gun violence prevention during a national walkout on April 20, 2018, which marks the 19th anniversary of the Columbine High School shooting in Colorado. (Photo By Tom Williams/CQ Roll Call)

UNITED STATES - APRIL 20: Students march to the Capitol on Pennsylvania Avenue to call on Congress to act on gun violence prevention during a national walkout on April 20, 2018, which marks the 19th anniversary of the Columbine High School shooting in Colorado. (Photo By Tom Williams/CQ Roll Call)

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