Democratic presidential candidate Sen. Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.) on Sunday called 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 to "immediately" call the Senate back into session to pass a gun safety bill.

"Mitch McConnell should bring the Senate back into session immediately to pass HR 8, the gun safety bill that has already passed the House. That's a first step to addressing our serious gun violence epidemic," Sanders tweeted.

Mitch McConnell should bring the Senate back into session immediately to pass HR 8, the gun safety bill that has already passed the House. That's a first step to addressing our serious gun violence epidemic. — Bernie Sanders (@BernieSanders) August 4, 2019

Sanders' Senate colleague Sherrod Brown Sherrod Campbell BrownMnuchin says he and Pelosi have agreed to restart coronavirus stimulus talks Harris faces pivotal moment with Supreme Court battle Remote work poses state tax challenges MORE (D-Ohio) called on McConnell to do the same on CBS's "Face the Nation."

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Their call follows two deadly mass shootings Saturday and Sunday, in Texas and Ohio, that killed a combined total of 29 people.

The Saturday shooting in El Paso, Texas killed 20 people and injured 26 others.

The bill Sanders is calling for a vote on, H.R.8 or the "Bipartisan Background Checks Act of 2019," would require a background check on every gun sale or transfer.

It was passed by the Democratic-controlled House in February.

A spokesperson for McConnell did not immediately return a request for comment.