WASHINGTON, DC - JULY 05: A delegates wears a Hillary for president campaign hat as she waits for Democratic presidential candidate Hillary Rodham Clinton to address the 95th Representative Assembly of the National Education Association July 5, 2016 in Washington, DC. Clinton will be joined by President Barack Obama at a campaign stop in Charlotte, North Carolina later today. (Photo by Alex Wong/Getty Images)

WASHINGTON, DC - JULY 05: Delegates make noise with thundersticks as they wait for Democratic presidential candidate Hillary Rodham Clinton to address the 95th Representative Assembly of the National Education Association July 5, 2016 in Washington, DC. Clinton will be joined by President Barack Obama at a campaign stop in Charlotte, North Carolina later today. (Photo by Alex Wong/Getty Images)

WASHINGTON, DC - JULY 05: Delegates make noise with thundersticks as they wait for Democratic presidential candidate Hillary Rodham Clinton to address the 95th Representative Assembly of the National Education Association July 5, 2016 in Washington, DC. Clinton will be joined by President Barack Obama at a campaign stop in Charlotte, North Carolina later today. (Photo by Alex Wong/Getty Images)

WASHINGTON, DC - JULY 05: Delegates wait for Democratic presidential candidate Hillary Rodham Clinton to address the 95th Representative Assembly of the National Education Association July 5, 2016 in Washington, DC. Clinton will be joined by President Barack Obama at a campaign stop in Charlotte, North Carolina later today. (Photo by Alex Wong/Getty Images)

WASHINGTON, DC - JULY 05: Tourist watch as family members, and friends of victims of gun violence stage a sit-in inside the US Capitol Rotunda, July 5, 2016 in Washington, DC. The group said they are calling on members of Congress to come up with common sense solutions to gun violence, including universal background checks, and an assault weapon and high-capacity magazine ban. (Photo by Mark Wilson/Getty Images)

WASHINGTON, DC - JULY 05: Democratic presidential candidate Hillary Rodham Clinton greets supporters after she addressed the 95th Representative Assembly of the National Education Association July 5, 2016 in Washington, DC. Clinton will be joined by President Barack Obama at a campaign stop in Charlotte, North Carolina later today. (Photo by Alex Wong/Getty Images)

WASHINGTON, DC - JULY 05: US Capitol Police try to clear the area as family members, and friends of victims of gun violence stage a sit-in inside the US Capitol Rotunda, July 5, 2016 in Washington, DC. The group said they are calling on members of Congress to come up with common sense solutions to gun violence, including universal background checks, and an assault weapon and high-capacity magazine ban. (Photo by Mark Wilson/Getty Images)

WASHINGTON, DC - JULY 05: Family members and friends of victims of gun violence stage a sit-in inside the US Capitol Rotunda, July 5, 2016 in Washington, DC. The group said they are calling on members of Congress to come up with common sense solutions to gun violence, including universal background checks, and an assault weapon and high-capacity magazine ban. (Photo by Mark Wilson/Getty Images)