GOP Sen. Pat Toomey Patrick (Pat) Joseph ToomeyAppeals court rules NSA's bulk phone data collection illegal Dunford withdraws from consideration to chair coronavirus oversight panel GOP senators push for quick, partial reopening of economy MORE (Pa.) on Sunday called for background check legislation after two deadly mass shootings rocked the U.S.

"While no law will end mass shootings entirely, it's time for Congress to act to help keep our communities safer," Toomey tweeted.

"We should start by passing bipartisan proposals such as my legislation with Senator Joe Manchin Joseph (Joe) ManchinSenate passes resolution reaffirming commitment to peaceful transition of power Hopes for DC, Puerto Rico statehood rise Manchin defends Supreme Court candidate Barrett: 'It's awful to bring in religion' MORE to expand background checks to all commercial firearm sales."

While no law will end mass shootings entirely, it's time for Congress to act to help keep our communities safer. We should start by passing bipartisan proposals such as my legislation with Senator Joe Manchin to expand background checks to all commercial firearm sales. — Senator Pat Toomey (@SenToomey) August 4, 2019

A gunman killed 20 people and wounded dozens more in an attack at a Walmart in El Paso, Texas, on Saturday.

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Less than a day later, at least nine people were killed and more than two dozen were injured in a Dayton, Ohio, shooting. The two shootings are not believed to be linked.

The House passed a universal background check bill earlier this year which would prohibit most person-to-person firearm transfers without such a check, aiming to close potential loopholes.

Eight Republicans joined the overwhelming majority of Democrats to pass the bill, but it remains stalled in the Senate.

Toomey and Democratic Sen. Joe Manchin (W.Va.) first introduced their background check bill, which would expand background checks to include unlicensed gun-show dealers and online sales, in 2013.

Sen. Susan Collins Susan Margaret CollinsThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Billionaire who donated to Trump in 2016 donates to Biden Credit union group to spend million on Senate, House races MORE (R-Maine) also expressed support for background checks Sunday, though she did not reference any particular bill.

"I have long supported closing loopholes in background checks to prevent the sale of firearms to criminals and individuals with serious mental illness," Collins tweeted.

I have long supported closing loopholes in background checks to prevent the sale of firearms to criminals and individuals with serious mental illness. — Sen. Susan Collins (@SenatorCollins) August 4, 2019

Toomey on Sunday also joined Sen. Lindsey Graham Lindsey Olin GrahamSteele Dossier sub-source was subject of FBI counterintelligence probe Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Key Democrat opposes GOP Section 230 subpoena for Facebook, Twitter, Google MORE (R-S.C.) in calling for a "red flag" measure.

"I also agree with Senator Lindsey Graham that we should pass a bipartisan 'red flag' measure that enables families and law enforcement to obtain a court order to keep guns away from dangerous individuals," he tweeted.

Graham tweeted earlier Sunday that it "may not have mattered here, but Red Flag laws have proven to be effective in states that have them."

Republicans have supported that gun control measure, which would allow family members or law enforcement officials to limit a person's access to guns if they are deemed a potential threat.

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.) is facing mounting calls from mostly Democratic lawmakers to bring senators back from recess to pass the House's background check bill.