March For Our Lives

Protesters hold up signs Saturday outside the U.S. Embassy in London.

British Musician Sir Paul McCartney (left) and his wife Nancy Shevell attend the March For Our Lives protest in New York on March 24, 2018.

David Hogg, a survivor of the school shooting at Marjory Stoneman Douglas High School, speaks during the March For Our Lives in Washington, D.C. on March 24 2018.

Crowds of people hold signs in Washington, D.C., at the “March for Our Lives” rally in support of gun control Saturday.

Marjory Stoneman Douglas High School student Emma Gonzalez, center, and singer Jennifer Hudson, left, embrace during the March for Our Lives Rally in Washington, D.C. on March 24, 2018.

Demi Lovato performs during the March for Our Lives rally in Washington, D.C. on March 24, 2018.

People on the balcony at the Newseum join with protesters on Pennsylvania Avenue as they look toward the stage near the Capitol during the March for Our Lives rally in support of gun control in Washington, D.C. on March 24, 2018.

Marjory Stoneman Douglas High School student Delaney Tarr speaks at the March for Our Lives rally in Washington, D.C. on March 24, 2018.

People take part in the March for Our Lives rally in New York on March 24, 2018.

Trevon Bosley, of Chicago, the brother of Terrell Bosley who was killed in 2006 in a case of mistaken identity, speaks during the March for Our Lives rally in Washington, D.C. on March 24, 2018.

Isabel White of Parkland, Fla. holds a sign that reads “Americans for Gun Safety Now!” during the March for Our Lives rally in Washington, D.C. on March 24, 2018.

Marjory Stoneman Douglas High School Student Ryan Deitsch addresses the March for Our Lives rally in Washington, D.C. on March 24, 2018.

Cameron Kasky, a survivor of the mass shooting at Marjory Stoneman Douglas High School in Parkland, Fla., speaks during the March for Our Lives rally in Washington, D.C. on March 24, 2018.

Supporters of stricter gun control hold signs during a solidarity rally with the U.S. March For Our Lives outside the American Embassy in London on March 24, 2018.

Participants arrive at the March for Our Lives rally in Washington on March 24, 2018. Galvanized by a massacre at a Florida high school, hundreds of thousands of Americans are expected to take to the streets across the United States on Saturday in the biggest protest for gun control in a generation.

Thousands of people gather for March For Our Lives on Pennsylvania Avenue in Washington, D.C. on March 2018.

Lillie Perez, 11, holds a sign during a March for Our Lives protest in Houston on March 24, 2018.

People gather at the March for Our Lives rally in Washington, D.C. on March 24, 2018.

Common and Andra Day perform with members of the Cardinal Shehan School Choir during the March for Our Lives rally in Washington, D.C. on March 24, 2018.