GOP lawmaker calls for tougher rules on background checks, bump stocks

Rep. Ryan CostelloRyan Anthony CostellloRep. Brendan Boyle decides against Pennsylvania Senate bid Pennsylvania's Democratic lt. governor files to run for Senate Bottom Line MORE (R-Pa.) on Sunday called for tougher rules on background checks and bump stocks, and appeared to signal support for a ban on assault rifles following the deadly shooting in Parkland, Fla.

"The Toomey-Manchin bill should pass. That should be done. Bump stocks should be done We need to do the Fix NICS [National Instant Criminal Background Check System] bill," Costello, who represents a swing district in suburban Philadelphia, told MSNBC's Kasie Hunt. 

The lawmaker was referring to a bill being revived by Sens. Pat ToomeyPatrick (Pat) Joseph ToomeyBlack women look to build upon gains in coming elections Watch live: GOP senators present new infrastructure proposal Sasse rebuked by Nebraska Republican Party over impeachment vote MORE (R-Pa.) and Joe ManchinJoe ManchinDemocrats warn shrinking Biden's spending plan could backfire Top Democrat: 'A lot of spin' coming from White House on infrastructure An August ultimatum: No recess until redistricting reform is done MORE (D-W.Va.), which calls for expanding background checks for firearms purchases. 

Costello also referenced bump stocks, devices that allow semi-automatic guns to be modified to shoot hundreds of rounds per minute, which President TrumpDonald TrumpMeghan McCain: Democrats 'should give a little credit' to Trump for COVID-19 vaccine Trump testing czar warns lockdowns may be on table if people don't get vaccinated Overnight Health Care: CDC details Massachusetts outbreak that sparked mask update | White House says national vaccine mandate 'not under consideration at this time' MORE suggested he wanted to ban. Costello had signed on to a bill last year that would have also banned the devices following the mass shooting at a music festival in Las Vegas. 

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Pressed if by Hunt if he would support a ban on assault rifles, Costello appeared to signal he would if it were defined correctly.

"I think that there's a group of things that everyone can agree to, and then we move into this discussion and hopefully develop a vocabulary that everyone can wrap their arms around," he said.

The development comes after a gunman opened fire at Marjory Stoneman Douglas High School earlier this month with an AR-15, killing 17 and wounding several others. 

The FBI and the Broward County Sheriff's Office are under intense scrutiny after it was revealed red flags were raised about the suspect in the shooting, 19-year-old Nikolas Cruz, in the lead-up to the tragedy.

Cruz purchased the AR-15 last year. 

The shooting has reignited the debate over gun control across the country, with many calling for tougher measures. 

Trump has offered an array of ideas, including "comprehensive" background checks, banning bump stocks and raising the minimum age to purchase weapons like the AR-15 to 21.

Various Republican lawmakers and the National Rifle Association have in turn spoken out against raising the age to buy an AR-15.