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J.J. Miller, 17, of Baltimore, Md., blows bubbles as crowds arrive for the "March for Our Lives" rally in support of gun control, Saturday, March 24, 2018, in Washington.

Crowds of people hold signs on Pennsylvania Avenue at the "March for Our Lives" rally in support of gun control, Saturday, March 24, 2018, in Washington.

Participants gather during the March For Our Lives-Parkland event Saturday, March 24, 2018, in Parkland, Fla.

Pre-school teacher Maena St. Paul takes part in the March For Our Lives-Parkland event, Saturday, March 24, 2018, in Parkland, Fla.

Becky Barger of Cornelius N.C. holds a banner during the "March for Our Lives" rally in support of gun control in Washington, Saturday, March 24, 2018, on Pennsylvania Avenue near the U.S. Capitol.

Steven Rothman, left, and Dan Knorowski attend the "March for Our Lives" rally in support of gun control in Washington, Saturday, March 24, 2018.

Sofia Briceno, left, and Josie Dang, hold banners during the "March for Our Lives" rally in support of gun control in Washington, Saturday, March 24, 2018, on Pennsylvania Avenue near the U.S. Capitol.

A woman holds a sign with an American flag dripping red and its stars replaced by bullets while protesting at the "March for our Lives" gathering on March 24, 2018 in Berlin, Germany. The protest in Berlin, attended by several hundred mostly expat Americans, was to show solidarity with "March for our Lives" demonstrations across the U.S. demanding stricter gun control legislation. The U.S. protests were initiated by surviving students from the shooting massacre last month at Marjory Stoneman Douglas High School in Parkland, Florida, in which 17 people were killed and 17 more were wounded.

Crowds of people hold signs on Pennsylvania Avenue at the "March for Our Lives" rally in support of gun control, Saturday, March 24, 2018, in Washington.

Ayanne Johnson, a student from Great Mills High School in southern Maryland holds up the photograph of her classmate Jaelynn Willey during the "March for Our Lives" rally in support of gun control in Washington, Saturday, March 24, 2018. Willey was killed by a classmate this week at the school in southern Maryland.

People take part in a march rally against gun violence Saturday, March 24, 2018, in New York. Tens of thousands of people poured into the nation's capital and cities across America on Saturday to march for gun control and ignite political activism among the young.

People take part in a march rally against gun violence Saturday, March 24, 2018, in New York. Tens of thousands of people poured into the nation's capital and cities across America on Saturday to march for gun control and ignite political activism among the young.

Protesters hold up signs outside the US Embassy in London, Saturday March 24, 2018, in solidarity with the 鈥淢arch for Our Lives鈥� protest against gun violence.

American students and expats hold signs calling for stricter gun control during in a solidarity rally with 'March For Our Lives' on the "Place des Nations" in front of the European headquarters of the United Nations, in Geneva, Switzerland, Saturday, March 24, 2018.

Connor Feliu of Syracuse N.Y., covered in red paint, attends the "March for Our Lives" rally in support of gun control in Washington, Saturday, March 24, 2018, on Pennsylvania Avenue near the U.S. Capitol.

Demonstrators pass a makeshift memorial to school shooting victims during a "March for Our Lives" protest for gun legislation and school safety Saturday, March 24, 2018, in Houston. Students and activists across the country planned events Saturday in conjunction with a Washington march spearheaded by teens from Marjory Stoneman Douglas High School in Parkland, Fla., where 17 people were killed in February.

Sir Paul McCartney joins thousands of people, many of them students, march against gun violence in Manhattan during the March for Our Lives rally on March 24, 2018 in New York, United States. More than 800 March for Our Lives events, organized by survivors of the Parkland, Florida school shooting on Feb. 14 that left 17 dead, are taking place around the world to call for legislative action to address school safety and gun violence.

(L to R) Henrietta Hamilton, 5, and Marlowe Sturridge, 5, ride on their fathers' shoulders as they march on Sixth Avenue during the March For Our Lives, March 24, 2018 in New York City. Thousands of demonstrators, including students, teachers and parents are gathering in Washington, New York City and other cities across the country for an anti-gun violence rally organized by survivors of the Marjory Stoneman Douglas High School school shooting on Feb. 14 that left 17 dead. More than 800 related events are taking place around the world to call for legislative action to address school safety and gun violence.

Supporters of President Donald Trump counter-protest during the March For Our Lives, March 24, 2018 in New York City. Thousands of demonstrators, including students, teachers and parents are gathering in Washington, New York City and other cities across the country for an anti-gun violence rally organized by survivors of the Marjory Stoneman Douglas High School school shooting on Feb. 14 that left 17 dead. More than 800 related events are taking place around the world to call for legislative action to address school safety and gun violence. (Photo by Drew Angerer/Getty Images)

A protestor holds a sign featuring student activist David Hogg and President Donald Trump during the March For Our Lives, March 24, 2018 in New York City. Thousands of demonstrators, including students, teachers and parents are gathering in Washington, New York City and other cities across the country for an anti-gun violence rally organized by survivors of the Marjory Stoneman Douglas High School school shooting on Feb. 14 that left 17 dead. More than 800 related events are taking place around the world to call for legislative action to address school safety and gun violence.