The former White House press secretary under President George W. Bush on Thursday called on President Trump to ban bump stocks, a push that has gained traction following the mass shooting in Las Vegas.

“If I were Trump I would direct ATF 2classify bump stocks as part of a weapon and ban them today. He should also welcome legislation 2do same,” Ari Fleischer wrote on Twitter.

“If I were a Democrat, I wouldn't amend a bump stock ban with broader gun control efforts. Join together and get something done. Please.”

If I were Trump I would direct ATF 2classify bump stocks as part of a weapon and ban them today. He should also welcome legislation 2do same — Ari Fleischer (@AriFleischer) October 5, 2017

Stephen Paddock, the suspected gunman in the Sunday night shooting, reportedly had two bump stocks, devices that can be used to increase the rate of gunfire.

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In 2010, the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) declared that a bump stock is considered a part and therefore need not be regulated as a weapon.

The declaration came after Slide Fire Solutions, a company based in Texas, asked the bureau’s Firearms Technology Branch to assess its bump stock device. The company posted the letter it received from the ATF, which found that the part does not enable any automatic functions.

“The stock has no automatically functioning mechanical parts or springs and performs no automatic mechanical functions when installed. In order to use the installed device, the shooter must apply constant forward pressure with the non-shooting hands and constant rearward pressure with the shooting hand,” John R. Spencer, the Firearms Technology Branch’s chief, wrote in the letter.

“Accordingly, we find that the ‘bump-stock’ is a firearm part and is not regulated as a firearm under Gun Control Act or the National Firearms Act,” he wrote.

Republican Rep. Carlos Curbelo (Fla.) said Wednesday he plans to introduce bipartisan legislation to ban the device.

Earlier Wednesday, Senate Homeland Security Committee Chairman Ron Johnson Ronald (Ron) Harold JohnsonThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - White House moves closer to Pelosi on virus relief bill Second GOP senator to quarantine after exposure to coronavirus GOP-led panel to hear from former official who said Burisma was not a factor in US policy MORE (R-Wis.) said he would likely support legislation banning bump stocks.

Current law already bans the purchase of fully automatic weapons manufactured after 1986.