House Democrats stage sit-in

U.S. Rep. John Lewis (D-Ga.) speaks to gun control activists gathered outside the Capitol after House Democrats staged a sit-in on the House floor on June 22, 2016, and into the next morning.

Rep. Joe Kennedy III (D-Mass.) speaks to supporters outside the U.S. Capitol as House Democrats take part in a sit-in on the House floor June 23, 2016.

Rep. Tammy Duckworth (D-Ill.), who participated in the sit-in on the House floor to demand a vote on gun-control legislation, takes part in a TV interview outside of the House Chamber on June 23, 2016.

U.S. Speaker of the House Rep. Paul Ryan (R-Wisc.) arrives for votes as House Democrats stage a sit-in on the House floor June 22, 2016.

U.S. House Minority Leader Rep. Nancy Pelosi (D-Calif.) speaks during a news conference on gun control June 22, 2016 on Capitol Hill.

U.S. House Minority Leader Rep. Nancy Pelosi (D-Calif.) speaks during a news conference on gun control June 22, 2016 on Capitol Hill.