“Each of these measures deserves a vote,” Holder said. “American people deserve this vote in spite of the pressure that the special interests and lobbyists are exerting in back rooms on our elected officials.”

The Senate is expected to take up gun control legislation soon, but Democrats and Republicans are still fighting over language in the bill that would toughed background checks on gun purchases. It is unclear whether Democrats have the 60 votes necessary to begin debate on the bill.

In a winding speech, Biden spoke of meeting with 13 Americans who lost family members in the Sandy Hook shooting earlier Tuesday. Biden, his voice raising at times, said he wished “the members of Congress had been able to eavesdrop on the discussion in my home.”

“Don't they understand?” Biden asked of his former Senate colleagues. “They're talking about filibustering, I mean what are they doing?”

Biden noted on two occasions that Senate Minority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellSessions: 'We should be like Canada' in how we take in immigrants NSA spying program overcomes key Senate hurdle Overnight Finance: Lawmakers see shutdown odds rising | Trump calls for looser rules for bank loans | Consumer bureau moves to revise payday lending rule | Trump warns China on trade deficit MORE (Ky.) is among the senators who plan to filibuster. Biden and McConnell worked closely to pass the fiscal cliff bill several months ago.

Biden and Holder’s comments were the latest in a string of events intended to pressure the Senate on gun control.

President Obama on Monday spoke in Connecticut and met with relatives of the Sandy Hook victims. On Wednesday, first lady Michelle ObamaMichelle LeVaughn Robinson ObamaCriticism of Melania Trump shows a lot about the #MeToo movement Obama tells Letterman of showing off his 'dad moves' in front of Prince Smithsonian to unveil Obamas' portraits next month MORE is traveling to Chicago to speak about gun violence.