WASHINGTON, DC - JUNE 22: House Democratic Caucus Chair Rep. Xavier Becerra (D-CA) speaks to members of the media after a House Democratic Caucus meeting June 22, 2016 on Capitol Hill in Washington, DC. Democratic presidential candidate Hillary Clinton joined the House Democratic Caucus meeting as she continued to campaign for the election. (Photo by Alex Wong/Getty Images)

WASHINGTON, DC - JUNE 22: House Democratic Caucus Chair Rep. Xavier Becerra (D-CA) speaks to members of the media after a House Democratic Caucus meeting June 22, 2016 on Capitol Hill in Washington, DC. Democratic presidential candidate Hillary Clinton joined the House Democratic Caucus meeting as she continued to campaign for the election. (Photo by Alex Wong/Getty Images)

WASHINGTON, DC - JUNE 22: (R-L) House Democratic Caucus Chair Rep. Xavier Becerra (D-CA) speaks to members of the media as House Democratic Caucus Vice Chair Rep. Joseph Crowley (D-NY), Assistant Minority Leader Rep. James Clyburn (D-SC) and Chairman of Democratic Congressional Campaign Committee Rep. Ben Ray Lujan (D-NM) listen after a House Democratic Caucus meeting June 22, 2016 on Capitol Hill in Washington, DC. Democratic presidential candidate Hillary Clinton joined the House Democratic Caucus meeting as she continued to campaign for the election. (Photo by Alex Wong/Getty Images)

WASHINGTON, DC - JUNE 22: House Democratic Caucus Chair Rep. Xavier Becerra (D-CA) (R) speaks to members of the media after a House Democratic Caucus meeting June 22, 2016 on Capitol Hill in Washington, DC. Democratic presidential candidate Hillary Clinton joined the House Democratic Caucus meeting as she continued to campaign for the election. (Photo by Alex Wong/Getty Images)

WASHINGTON, DC - JUNE 22: House Democratic Caucus Chair Rep. Xavier Becerra (D-CA) (R) listens as Chairman of Democratic Congressional Campaign Committee Rep. Ben Ray Lujan (D-NM) (L) speaks to members of the media after a House Democratic Caucus meeting June 22, 2016 on Capitol Hill in Washington, DC. Democratic presidential candidate Hillary Clinton joined the House Democratic Caucus meeting as she continued to campaign for the election. (Photo by Alex Wong/Getty Images)

WASHINGTON, DC - JUNE 22: House Democratic Caucus Chair Rep. Xavier Becerra (D-CA) (R) speaks to members of the media as House Democratic Caucus Vice Chair Rep. Joseph Crowley (D-NY) (L) listens after a House Democratic Caucus meeting June 22, 2016 on Capitol Hill in Washington, DC. Democratic presidential candidate Hillary Clinton joined the House Democratic Caucus meeting as she continued to campaign for the election. (Photo by Alex Wong/Getty Images)

This image courtsy of Democratic Rep. Chellie Pingree's office shows members of Congress staging a sit-in on the floor of the US House of Representatives on June 22, 2016 in Washington, DC. US Democrats staged a rare sit-in Wednesday in the House of Representatives, demanding that the Republican-led body vote on gun-control legislation following the Orlando nightclub massacre."We have to occupy the floor of the House until there is action," Democratic Congressman John Lewis, a civil rights icon who marched with Reverend Martin Luther King Jr in the 1960s, said before he and dozens of colleagues sat down on the carpeted well of the chamber.The dramatic action came just as the House presiding officer moved to declare the body in recess. / AFP PHOTO / Rep. Chellie Pingree / Handout / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO /CONGRESSWOMAN CHELLIE PINGREE" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS HANDOUT/AFP/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 ÔNo Fly, No BuyÕ legislation and a universal background check bill. (Photo by Alex Wong/Getty Images)