WASHINGTON, DC - JUNE 22: U.S. Rep. Bobby Rush (D-IL) (C), whose son was a gun violence victim, is comforted by House Minority Leader Rep. Nancy Pelosi (D-CA) (R) and Rep. Brenda Lawrence (D-MI) (L) after he spoke during a news conference on gun control June 22, 2016 on Capitol Hill in Washington, DC. House Democrats are staging a sit-in on the House floor to demand Speaker Rep. Paul Ryan (R-WI) not to recess the House without voting on legislation including the bipartisan ÔNo Fly, No BuyÕ legislation and a universal background check bill. (Photo by Alex Wong/Getty Images)

WASHINGTON, DC - JUNE 22: Flanked by other House Democrats and Brady Campaign president Dan Gross (2nd R), U.S. House Minority Leader Rep. Nancy Pelosi (D-CA) speaks during a news conference on gun control June 22, 2016 on Capitol Hill in Washington, DC. House Democrats are staging a sit-in on the House floor to demand Speaker Rep. Paul Ryan (R-WI) not to recess the House without voting on legislation including the bipartisan ÔNo Fly, No BuyÕ legislation and a universal background check bill. (Photo by Alex Wong/Getty Images)

WASHINGTON, DC - JUNE 22: U.S. House Minority Leader Rep. Nancy Pelosi (D-CA) wears a rainbow wrist band as she speaks members of the media after a news conference on gun control June 22, 2016 on Capitol Hill in Washington, DC. House Democrats are staging a sit-in on the House floor to demand Speaker Rep. Paul Ryan (R-WI) not to recess the House without voting on legislation including the bipartisan ÔNo Fly, No BuyÕ legislation and a universal background check bill. (Photo by Alex Wong/Getty Images)

WASHINGTON, DC - JUNE 22: US President Barack Obama gets a hug from House Minority Leader Nancy Pelosi (D-CA), after signing the HR 2576 bill during an event in the Eisenhower Executive Office Building, June 22, 2016 in Washington, DC. The bill amends the Toxic Substances Control Act (TSCA), to revise the process and requirements for evaluating and determining whether regulatory control of a chemical is warranted. (Photo by Mark Wilson/Getty Images) *** BESTPIX ***

WASHINGTON, DC - JUNE 22: US President Barack Obama is flanked by members of Congress as he signs the HR 2576 bill during an event in the Eisenhower Executive Office Building, June 22, 2016 in Washington, DC. The bill amends the Toxic Substances Control Act (TSCA), to revise the process and requirements for evaluating and determining whether regulatory control of a chemical is warranted. (Photo by Mark Wilson/Getty Images) *** BESTPIX ***

WASHINGTON, DC - JUNE 22: (L-R) U.S. House Minority Leader Rep. Nancy Pelosi (D-CA), Rep. Joaquin Castro (D-TX) and Rep. G.K. Butterfield (D-NC) come out of the House Chamber for a news conference on gun control June 22, 2016 on Capitol Hill in Washington, DC. House Democrats are staging a sit-in on the House floor to demand Speaker Rep. Paul Ryan (R-WI) not to recess the House without voting on legislation including the bipartisan "No Fly, No Buy" legislation and a universal background check bill. (Photo by Alex Wong/Getty Images)

WASHINGTON, DC - JUNE 22: U.S. House Minority Leader Rep. Nancy Pelosi (D-CA) (L) speaks as Assistant Minority Leader Rep. James Clyburn (D-SC) (2nd L), and Brady Campaign president Dan Gross (R) listen during a news conference on gun control June 22, 2016 on Capitol Hill in Washington, DC. House Democrats are staging a sit-in on the House floor to demand Speaker Rep. Paul Ryan (R-WI) not to recess the House without voting on legislation including the bipartisan "No Fly, No Buy" legislation and a universal background check bill. (Photo by Alex Wong/Getty Images)

WASHINGTON, DC - JUNE 22: U.S. House Minority Leader Rep. Nancy Pelosi (D-CA) (C) speaks during a news conference on gun control June 22, 2016 on Capitol Hill in Washington, DC. House Democrats are staging a sit-in on the House floor to demand Speaker Rep. Paul Ryan (R-WI) not to recess the House without voting on legislation including the bipartisan "No Fly, No Buy" legislation and a universal background check bill. (Photo by Alex Wong/Getty Images)