An assault weapons ban is picking up steam in the House and on the 2020 campaign trail as Democrats search for a way to respond to two recent mass shootings while putting greater political pressure on recalcitrant Republican leaders.

Former Vice President Joe Biden Joe BidenPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Fox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio MORE, the front-runner in the Democratic presidential primary race, this week vowed to reinstate and strengthen the 1994 ban on assault weapons and high-capacity magazines if he’s elected president, declaring in a New York Times op-ed: “We have to get these weapons of war off our streets.”

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And nearly 200 House Democrats have now signed on to legislation — authored by Rep. David Cicilline David Nicola CicillineClark rolls out endorsements in assistant Speaker race Races heat up for House leadership posts The folly of Cicilline's 'Glass-Steagall for Tech' MORE (D-R.I.), the head of Democrats’ messaging operation — banning semi-automatic firearms and large-capacity magazines. With 198 co-sponsors, the bill is just 20 votes shy of the number needed to push it through the lower chamber.

Five Democrats added their names to Cicilline’s Assault Weapons Ban of 2019 in the immediate aftermath of the back-to-back massacres in El Paso, Texas, and Dayton, Ohio, that left a combined 32 dead and dozens more injured. Two more got on board on Tuesday: Rep. Joaquin Castro Joaquin CastroPompeo accused of stumping for Trump ahead of election Florida Democrat asks FBI to investigate anti-Semitic, racist disinformation Hispanic Caucus members embark on 'virtual bus tour' with Biden campaign MORE (D-Texas), the brother of Democratic presidential hopeful Julián Castro, and Rep. Cindy Axne Cindy AxneVulnerable Democrats tell Pelosi COVID-19 compromise 'essential' House passes bill to avert shutdown House moves toward spending vote after bipartisan talks MORE (D-Iowa), who unseated GOP Rep. David Young David Edmund YoungEric Idle threatens to sue GOP committee over use of Monty Python song in ad Trump: DeJoy should be removed if it 'can be proven that he did something wrong' The Hill's 12:30 Report - Presented by Facebook - Trump's Labor Day news conference MORE last fall.

“Meaningful action doesn’t end with signing a bipartisan background checks bill, which is important,” Rep. Anthony Brown Anthony Gregory BrownPelosi seeks to put pressure on GOP in COVID-19 relief battle Democrats demand Esper explicitly ban Confederate flag and allow Pride, Native Nations flags Trump tweets key GOP lawmaker has committed to not changing Confederate base names MORE (D-Md.), a co-sponsor of the Cicilline bill, told reporters in the Capitol Tuesday. “We have to ban high-capacity magazines that allowed the Dayton shooter and so many others to fire off tens of rounds in merely seconds. We have to ban assault weapons to get these weapons of war off our streets.”

A ban on military-style weapons won’t become law anytime soon even if the Democratic-held House passes legislation.

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.), a staunch Second Amendment advocate, has no intention of bringing the legislation to the floor, and President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE has said there’s “no political appetite” for such a ban; both men are allies of the National Rifle Association, which is vehemently opposed to any ban or moratorium.

Democrats are under no illusion of what they’re up against. But by pushing for an assault weapons ban, they are fulfilling several goals: showing their liberal base they are listening and aggressively fighting for tougher gun reforms, and ramping up political pressure on Trump and McConnell by demonstrating what Democrats would do if voters handed them control of the White House and Senate in the 2020 elections.

“Assault weapons were designed for one purpose: to kill people in war. Ordinary citizens should not own or have access to assault weapons,” Rep. Frederica Wilson Frederica Patricia WilsonHarris calls it 'outrageous' Trump downplayed coronavirus House passes bill establishing commission to study racial disparities affecting Black men, boys Florida county official apologizes for social media post invoking Hitler MORE (D-Fla.), another co-sponsor, told The Hill. Her state suffered two horrific mass shootings at an Orlando nightclub and Parkland high school in recent years.

“We will have to pressure and shame McConnell and the Senate,” she said, “and pressure the American people to do the same.”

Despite the fresh momentum, it’s not certain that the assault weapons ban will get a vote on the House floor. Democratic leaders of the House Judiciary Committee are weighing whether to haul the panel back to Washington during the long August recess for the purpose of taking up gun reforms beyond the popular background check legislation, which already passed out of the chamber in February.

House Majority Leader Steny Hoyer Steny Hamilton HoyerOn 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 Vulnerable Democrats tell Pelosi COVID-19 compromise 'essential' Anxious Democrats amp up pressure for vote on COVID-19 aid MORE (D-Md.) said Tuesday that gun reform would be the panel's first order of business, whenever they return.

But it remains unclear what measures Nadler will consider specifically, and Hoyer said Democrats are eyeing a host of potential possibilities. He rattled off several: an assault weapons ban, new restrictions on high-capacity magazines, banning those on the FBI's terrorist watch list from buying guns and “red flag” legislation, which empowers local law enforcers to seize guns from those found by the courts to pose a danger to themselves or others.

“Certainly we're going to consider any bills eligible for the floor that the Judiciary Committee has considered and passed,” Hoyer said, suggesting quick action when Congress returns.

As Senate Judiciary Committee chairman in 1994, Biden shepherded through the upper chamber the landmark crime bill that included the federal assault weapons ban. President Clinton signed it into law that year, but the 10-year ban expired in 2004 with little action since then.

Some Democrats have pointed to the ban as the reason the House flipped to Republican control in the 1994 midterm elections, and there is concern among some in the party now that voting on the ban would put Democrats from Trump districts, like freshman Reps. Abigail Spanberger Abigail Davis SpanbergerVulnerable Democrats tell Pelosi COVID-19 compromise 'essential' Trump asked Chamber of Commerce to reconsider Democratic endorsements: report Virginians wait up to four hours to cast early voting ballots MORE (Va.) and Joe Cunningham Joseph CunninghamKate Schroder in Ohio among Democratic challengers squelching GOP hopes for the House Warning signs flash for Lindsey Graham in South Carolina Trump asked Chamber of Commerce to reconsider Democratic endorsements: report MORE (S.C.), in an extremely tough spot. Cunningham said last week he has concerns about local police being on the "receiving end" of an AR-15 but has not added his name to the bill.

But there is also evidence that support for an assault weapons ban may not be the political albatross it once was for swing-district Democrats. According to a Politico–Morning Consult poll conducted after the pair of shootings, seven in 10 Americans support legislation banning assault-style weapons; 55 percent of GOP voters said they back such a ban.

Cicilline has not attracted any GOP co-sponsors yet, but Rep. Mike Turner Michael Ray TurnerHispanic Caucus campaign arm endorses slate of non-Hispanic candidates Overnight Defense: Trump announces 'snapback' of sanctions on Iran | Uniformed personnel at Dem convention under investigation | Netanyahu calls reported F-35 deal 'fake news' Democrats go big on diversity with new House recruits MORE (R-Ohio), the former Dayton mayor, says he now backs a ban on military-style weapons, and Rep. Adam Kinzinger Adam Daniel KinzingerFox News reporter defends confirming Atlantic piece despite Trump backlash: 'I feel very confident' GOP lawmaker defends Fox reporter after Trump calls for her firing Lindsey Graham: 'QAnon is bats--- crazy' MORE (R-Ill.), who is training with the Air National Guard this week, said he supports "banning certain high capacity magazines, like the 100-round drum the Dayton shooter used."

A dozen Democrats from districts that Trump won in 2016 are now co-sponsoring the Cicilline bill, according to an analysis by The Hill.

They include freshman Reps. Max Rose Max RoseLawmakers fear voter backlash over failure to reach COVID-19 relief deal The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep Navy cancels training flight over NYC on 9/11 after criticism MORE (N.Y.), Matt Cartwright Matthew (Matt) Alton CartwrightRaces heat up for House leadership posts Trump Jr. seeks to elect 'new blood' to Republican Party Republicans face worsening outlook in battle for House MORE (Pa.), Angie Craig (Minn.), Susie Lee Suzanne (Susie) Kelley LeeMORE (Nev.), Antonio DelgadoAntonio Ramon DelgadoGOP leader says he doesn't want Chamber's endorsement: 'They have sold out' US Chamber of Commerce set to endorse 23 House freshman Democrats Democrats go big on diversity with new House recruits MORE (N.Y.) and Lucy McBath Lucia (Lucy) Kay McBathThis week: House returns for pre-election sprint House Democrats' campaign arm reserves .6M in ads in competitive districts Black Lives Matter movement to play elevated role at convention MORE (Ga.), who became a gun control activist after her 17-year-old son was shot and killed during a dispute at a gas station about loud music.

Reps. Josh Gottheimer Joshua (Josh) GottheimerVulnerable Democrats tell Pelosi COVID-19 compromise 'essential' Centrist House group offers bipartisan COVID-19 relief deal Hillicon Valley: Lawmakers introduce resolution condemning QAnon | US Cyber Command leader vows to 'defend forward' in protecting nation from cyberattacks MORE (N.J.) and Chris PappasChristopher (Chris) Charles PappasTrump-backed candidate wins NH GOP primary to take on Pappas Democrats demand Esper explicitly ban Confederate flag and allow Pride, Native Nations flags Trade groups make lobbying push to be included in small business loan program MORE (N.H.), two other Democrats representing Trump districts, joined the effort in the days following El Paso and Dayton.

“Congress should immediately return to Washington for a special session to take practical steps to curb the epidemic of gun violence in our country, including many measures even the President and Republicans have supported: implementing red flag laws, banning military-style assault weapons and high capacity magazines, and instituting background checks for all purchases, including at gun shows,” Gottheimer, co-chairman of the bipartisan Problem Solvers Caucus, wrote in an op-ed in The Star-Ledger this week.

Two Democrats who know how dangerous and deadly these assault weapons can be are Reps. Mikie Sherrill Rebecca (Mikie) Michelle SherrillHillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll House passes legislation to boost election security research Lawmakers call for bipartisan push to support scientific research MORE (N.J.), a former Navy helicopter pilot, and Jason CrowJason CrowClark rolls out endorsements in assistant Speaker race Trump-Afghan deal passes key deadline, but peace elusive Cook shifts 20 House districts toward Democrats MORE (Colo.), a former Army Ranger in the Iraq and Afghanistan wars. The parents of young children, both freshman lawmakers have signed on to Cicilline’s assault weapons ban

“We’ve never fought for anyone’s right to turn a high school hallway, synagogue, concert, church or Walmart into a battlefield. There’s a lot we hope our children learn at school, but active shooter drills shouldn’t be in the curriculum,” Sherrill and Crow wrote in a joint op-ed in USA Today as thousands of children returned to school this week.

“Addressing the crisis of gun violence will take leadership and courage. If the Senate refuses to act, then we must vote them out. Let’s show Americans what leadership really looks like. Our children are watching, and learning to see what we do next.”

The children are also on the mind of Wilson, but the Florida congresswoman is done trying to gloss over the horror of these mass executions.

“We have to remind the American people that the children that were gunned down with assault weapons at Sandy Hook Elementary, their bodies had to be removed with shovels; they were smashed to pieces,” Wilson said. “The same happened in Parkland. These weapons are meant to rip your body apart.”

Mike Lillis contributed.