Senators sent similar letters to airlines last year, requesting full cash refunds instead of flight credit to customers forced to cancel air travel during the pandemic.
The Democratic senator suggested McConnell's actions were only a "first test" for Democrats in the upper chamber.
The legislation would provide $5 billion to the Public Health and Social Services Emergency Fund for states that implement mask requirments.
"There is no reason for these platforms to have blanket immunity, a shield against any accountability that is not enjoyed by any other industry in the same way," said U.S. Senator Richard Blumenthal.
Senator Richard Blumenthal (D-Conn.) led a group of 15 senators sponsoring the Untraceable Firearms Act of 2020 on Thursday, which would regulate parts and materials commonly used to make untraceable "ghost guns."
Richard Blumenthal said Murkowski's statements reflected "strong reservations" held by other Republicans in the Senate.
Connecticut Sen. Richard Blumenthal told MSNBC that "unpredicted evidence" could prompt more Republican senators to vote against Trump.
"How can we refuse to see that shooting in real time, demanding our attention, requiring our action?" Senator Blumenthal asked his colleagues as he learned of the Santa Clarita shooting.
The attorney general labeled the controversy he's found himself enveloped in as "mind-bendingly bizarre."
"Lying to the American people may not be itself breaking the law, but if it's part of a conspiracy, part of aiding and abetting other illicit actions, we need to see the full special counsel report and all that he knows," Democrat Richard Blumenthal said.
Many view the tweet as an admission that Trump was aware Flynn had lied to federal agents when he fired him.
In a letter to the Department of Homeland Security, the senator pushed for an evaluation of whether the administration "is selectively disclosing or manipulating data."
Democrats held a press conference Tuesday to explain their lawsuit against the president.
Democrats claim Trump has been receiving foreign profits in violation of the U.S. Constitution.
Chuck Schumer and other Democrats are urging Republicans to choose another Supreme Court nominee.
White House strategist confirms top court hopeful criticized Trump's attacks on the judiciary, but the president says senator misrepresented his thoughts.
One senator compared Trump's opportunity to enact gun laws to President Richard Nixon's visit to China in 1972.
Democrats are acting on their pledges to push for gun legislation.
Senator Chris Murphy vows to remain on the floor until his Republican colleagues compromise on two gun control issues.