As the U.S. government scrambles to tighten its security and make it harder for a tragedy like the Nov. 13 Paris attacks to occur on American soil, it has uncovered some disastrous holes in its anti-terrorism measures.

According to a report released by the Government Accountability Office (GAO), at least 2,043 known and suspected terrorists have legally purchased firearms in the United States between 2004 and 2014.

Under federal law, felons, fugitives, drug addicts and domestic abusers cannot legally buy guns. The law is supposed to keep deadly weapons out of the hands of people with violent or criminal histories, and thus keep the rest of us more safe. However, the same law doesn’t stop people on the FBI’s terrorist watchlist from freely buying guns and ammunition.

The Senate is attempting to introduce a bill aptly named the “Denying Firearms and Explosives to Dangerous Terrorists Act of 2015” to prevent people on the FBI watchlist from purchasing guns, but remains stuck in committee due to opposition from the NRA. However, a 2012 survey of NRA members found that 71 percent of Americans would support denying firearms to potential terrorists.

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Christopher Ingraham of the Washington Post reported that while the GAO’s numbers are alarming, critics from both sides of the political spectrum have reason to oppose the bill.

The biggest knock against the proposed legislation is perhaps that the FBI’s watchlist is an imperfect tool for assessing an individual’s terror threat. Civil libertarians warn that the watchlist has ballooned in size to nearly 700,000 individuals in recent years. Many of those people may simply be family members, acquaintances or people only marginally acquainted with individuals who actually belong to terror groups. The NRA and its allies are worried that perfectly law-abiding people may end up on a watchlist and be unable to purchase a gun.

Sound off in the comments if you think this report is worth acting on.