Democrats are calling on Senate Majority Leader Mitch McConnell to bring the Senate back in session to vote on gun control legislation in response to two mass shootings that killed 29 people in less than 24 hours.

A Saturday shooting at an El Paso, Texas, Walmart left 20 people dead and 26 more wounded. Federal authorities are treating it as a case of domestic terrorism and will pursue federal hate crime and firearm charges, officials said Sunday. A separate shooting early Sunday morning in Dayton, Ohio, left nine dead and 27 wounded.

Democrats are asking McConnell to call Senate, which is currently on a month-long recess, back to vote on a background check bill passed by the Democratic-controlled House in February.

"El Paso, Dayton, one awful event after another. @SenateMajLdr McConnell must call the Senate back for an emergency session to put the House-passed universal background checks legislation on the Senate floor for debate and a vote immediately," Senate Minority Leader Chuck Schumer (D-N.Y.) tweeted Sunday morning.

"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," White House hopeful and Sen. Bernie Sanders (I-Vt.) tweeted.

"We must treat this like the public health crisis that it is," fellow 2020 candidate Sen. Elizabeth Warren (D-Mass.) tweeted "@SenMajLdr: Bring the Senate back from recess to vote on legislation to address the gun violence epidemic."

When asked by CBS's "Face the Nation" host if he supports returning to D.C. for a vote, Sen. Tim Scott (R-S.C.) said he'd "be happy to go back."

"I'd leave tonight. I'll go tomorrow, it doesn't matter to me. This is such an important issue," Scott said.

Ohio Sen. Sherrod Brown also said McConnell should call for Senate to come back into session to pass the universal background check bill.

Rep. Harley Rouda (D-Calif.) tweeted it is "time for a special session of congress to make this mass shooting the last."

"I'm heartbroken and disgusted. Thoughts and prayers from NRA apologists in Congress are insulting to victims. Their silence is deafening- It makes them permissive, even complicit in this epidemic," he tweeted.

Rep. Alexandria Ocasio-Cortez did not explicitly call for a special session, but she tweeted that McConnell should "explain to the people why" he hasn't called for a vote on the bill the House passed in February.

Hillary Clinton, the 2016 Democratic presidential candidate, tweeted that "thoughts and prayers are not enough," after the two deadly shootings in less than 24 hours.

"We need action," she said. "The House has sent common-sense gun safety legislation to the Senate. Demand that @senatemajldr and your Republican elected officials join Democrats to pass it."

The House passed the bill with overwhelming Democratic support, and some support from Republicans.

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