Senate Democrats proposed a new bill Wednesday that would block guns from being sold in the absence of a background check.

The proposal introduced Wednesday by Democratic Sens. Richard Blumenthal and Chris Murphy of Connecticut, as well as Dianne Feinstein of California, would change current law that allows federally licensed gun retailers to sell a firearm without a background check after 72 hours.

This loophole is commonly referred to as the "Charleston" loophole, and is one that allowed Dylann Roof, the alleged shooter that left nine churchgoers dead in Charleston, S.C., to buy a gun after the expiration of the 72-hour wait time for his background check.

Democrats urged their Senate colleagues to back their legislation, and called it a "simple solution" that can "reduce gun violence and save lives."

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