More than 200 Democratic House lawmakers led by Gun Violence Prevention Task Force Chairman Mike Thompson Charles (Mike) Michael ThompsonHouse Democrats unveil green tax package The Hill's Coronavirus Report: BIO's Michelle McMurry-Heath says 400 projects started in 16 weeks in biotech firms to fight virus, pandemic unemployment total tops 43 million Gun control group rolls out House endorsements MORE (D-Calif.) are trying to ramp up pressure on Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellTrump 'no longer angry' at Romney because of Supreme Court stance On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline The Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power MORE (R-Ky.) to call a vote on House-passed legislation aimed at strengthening background checks for gun purchases.

In a letter sent to McConnell on Wednesday, following two mass shootings last weekend, the 213 lawmakers argued the legislation is backed by the majority of Americans and would implement a live-saving policy.

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“We strongly urge you to take immediate action to call the Senate back into session to pass H.R. 8, the Bipartisan Background Checks Act and H.R. 1112, the Enhanced Background Checks Act,” they wrote.

“In February, the new Democratic House Majority took swift action to pass these bipartisan bills which not only save lives, but also has the support of more than 90 percent of the American people. Since that time, you have allowed more than 150 days to pass and countless lives have been lost including those most recently lost in Gilroy, California, El Paso, Texas, Dayton, Ohio, Chicago, Illinois and the many others who will never make the headlines.”

The group said background checks are proven to help prevent criminals from obtaining weapons and deter future instances of mass violence.

"This inaction must stop. We know background checks save lives. Every day background checks stop more than 170 felons and 50 domestic abusers from getting a gun,” the continued.

“Any delay to pass commonsense gun violence prevention legislation only increases the chances that more innocent people in America may suffer from the tragic and needless loss caused by gun violence.”

The letter follows House Speaker Nancy Pelosi Nancy PelosiPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Trump signs largely symbolic pre-existing conditions order amid lawsuit MORE (D-Calif.) and Senate Minority Leader Charles Schumer Chuck SchumerPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' 3 reasons why Biden is misreading the politics of court packing Cruz blocks amended resolution honoring Ginsburg over language about her dying wish MORE (D-N.Y.) calling on McConnell to cut the upper chamber’s August recess short to bring up gun control measures.