Elizabeth Warren joins House Dems' sit-in
© Haiyun Jiang

Sen. Elizabeth WarrenElizabeth Ann WarrenWarren set to announce plan for universal child care: reports Barack, Michelle Obama expected to refrain from endorsing in 2020 Dem primary: report Booker seeks dialogue about race as he kicks off 2020 campaign MORE (D-Mass.) on Wednesday trekked across the Capitol to join House Democrats' sit-in, showing solidarity with their push for votes on expanding gun safety measures.

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Democrats, led by civil rights icon Rep. John Lewis (D-Ga.), began their sit-in on the House floor late Wednesday morning. They say they will continue their protest until GOP leaders allow some sort of action on legislation to prevent terror suspects from buying guns.

Warren, who's reportedly on the shortlist to be Hillary ClintonHillary Diane Rodham ClintonRoger Stone shares, quickly deletes Instagram photo of federal judge on his case Barack, Michelle Obama expected to refrain from endorsing in 2020 Dem primary: report Why the national emergency? A second term may be Trump’s only shield from an indictment MORE's running mate, briefly sat down on the floor with other lawmakers. She later moved to a chair.

She noted in a Twitter post showing a photo of the House floor that it is also her birthday.

"Nowhere I'd rather spend my bday than the House floor w/ @repjohnlewis for gun control. #NoBillNoBreak #goodtrouble" Warren, a favorite of the liberal left, tweeted.

Multiple House members tweeted photos of Warren joining their protest, including fellow Massachusetts Democrat Rep. Jim McGovern.

".@SenWarren is a true champion for #Massachusetts. Proud #mapoli is united in saying it's time to #StopGunViolence," McGovern tweeted.

In addition to Warren, many Democratic senators made appearances in the House chamber. Connecticut Democratic Sens. Chris MurphyChristopher (Chris) Scott MurphyCongress closer to forcing Trump’s hand on Saudi support House passes bill to end US support for Saudi war in Yemen This week: Border deal remains elusive as shutdown looms MORE and Richard Blumenthal, who similarly commandeered the Senate floor last week to push for votes on gun control, both came to see the House activity.

House Democrats are warning that their sit-in could last into the night, postponing scheduled legislative business.

GOP leaders ordered the House go into recess, which means the chamber's cameras were turned off. Democrats participating in the sit-in have turned to streaming live video with smartphone apps such as Periscope so that the public can watch.

Sen. Bernie SandersBernard (Bernie) SandersCongress closer to forcing Trump’s hand on Saudi support Booker seeks dialogue about race as he kicks off 2020 campaign Capitalism: The known ideal MORE (I-Vt.) has not made an appearance at the sit-in so far. But he did post a tweet in support of House Democrats.

"Change only happens when people come together to say the status quo is unacceptable. We stand with you @HouseDemocrats. #NoBillNoBreak," Sanders's Senate office tweeted.