Wisconsin Reps. Mark Pocan and Gwen Moore joined House Democrats on Wednesday in a sit-in on the House floor to demand a vote on gun control measures.
Led by veteran civil rights leader Rep. John Lewis, of Georgia, about 100 Democrats vowed to "occupy the floor" until the proposals get a vote. Later Wednesday afternoon, Democratic senators including Wisconsin Sen. Tammy Baldwin joined their House colleagues.
The move comes shortly after the Senate failed to pass measures that would ban people on the government's terrorist watch list from purchasing guns and would expand required background checks for firearms purchases at gun shows and on the internet.
Democratic lawmakers are exerting a renewed effort to pass gun control legislation after a mass shooting at an Orlando gay nightclub earlier this month, the largest mass shooting in modern U.S. history.
Using the refrain, "No bill, no break," Democrats demanded the House be kept in session to debate the legislation during a planned recess.
If lawmakers refuse to leave the chamber, House Speaker Paul Ryan must decide whether to keep the House in recess or to clear the floor and potentially sanction members.
In a press conference outside the Capitol, House Minority Leader Nancy Pelosi said Democrats "truly believe" if the legislation were given a vote, it would pass.
When the House is not formally in session, its cameras are off.
Because CSPAN relies on those cameras, the network has used Periscope and Facebook Live to stream video of the sit-in.
Lawmakers and reporters have also shared updates via social media using the hashtags #nobillnobreak, #nomoresilence and #goodtrouble.
Rep. Mark Pocan (D., Wis.) talks about his own experience leaving a gay club and being beaten with a baseball bat during the House sit-in.— Kristina L. Peterson (@kristinapet) June 22, 2016
Moore, who has previously been arrested in protests, said she is willing to face arrest for Wednesday's sit-in as well.
Ryan spokeswoman AshLee Strong tweeted this as the sit-in began:
The House cannot operate without members following the rules of the institution, so the House has recessed subject to the call of the chair.— AshLee Strong (@AshLeeStrong) June 22, 2016
Rep. Ron Kind, the remaining Democrat in Wisconsin's congressional delegation, tweeted his support for the sit-in.
Meanwhile, outgoing Republican Rep. Reid Ribble tweeted this: