Senate Democrats rolled out legislation Wednesday aimed at blocking guns from being sold without a background check.

The proposal, from Democratic Sens. Richard Blumenthal (Conn.), Chris Murphy Christopher (Chris) Scott MurphyDemocratic senator calls for 'more flexible' medical supply chain to counter pandemics The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon GOP chairman to release interim report on Biden probe 'in about a week' MORE (Conn.) and Dianne Feinstein Dianne Emiel FeinsteinBiden leads Trump by 12 points among Catholic voters: poll Names to watch as Trump picks Ginsburg replacement on Supreme Court McConnell says Trump nominee to replace Ginsburg will get Senate vote MORE (Calif.), would close a loophole that allows federally licensed gun retailers to sell a gun without a background check after 72 hours.

It is referred to as the Charleston loophole after the South Carolina city where Dylann Roof allegedly killed nine people in a mass shooting. The FBI said earlier this year that Roof was able to buy a gun after the three-day wait time for a background check expired.

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Democrats on Wednesday urged their colleagues to back the legislation, saying it is a simple and "straightforward" measure.

"The background check system is broken," Sen. Elizabeth Warren Elizabeth WarrenHarris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda Judd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report MORE (D-Mass.) said. "A bill that is this straightforward is a test for the United States Senate. It asks the fundamental question, 'Who do you work for?' ... So long as we don't act, we make it clear that this Congress works for the NRA [National Rifle Association].'"

Blumenthal, separately, said that any "inconvenience" created by having to wait longer for a background check is outweighed by lives saved.

"Waiting for a background check, even if longer than 72 hours, is a minor inconvenience far outweighed by the benefit of keeping lethal weapons out of the hands of dangerous people," he added.

The legislation already has a handful of Democratic backers, including Warren. However, it likely faces an uphill battle in the Senate where Republicans have shown little interest in moving forward with gun control legislation, instead focusing on mental health bills.

Blumenthal's office first announced that he would unveil the bill earlier this month.

Separately, dozen of Senate Democrats unveiled a sweeping gun control push earlier this month, with Sen. Charles Schumer Chuck SchumerSenate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' Jacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee MORE (D-N.Y.) suggesting they could try to introduce and move legislation later this year or early next year.