Senate nixed an Obama-era rule that could block some people receiving Social Security disability benefits from being able to buy a gun.
Senators voted 57-43 to strike down a regulation that requires the Social Security Administration to report people who receive disability benefits and have a mental health condition to the FBI's background check system.
The database is used to determine eligibility for buying a firearm.
The Senate's move will send the resolution of disapproval, which also passed the House last week, to President Trump's desk, where he is expected to sign it.
The rule was implemented by the Obama administration after the 2012 shooting at Sandy Hook Elementary School in Connecticut, where 20 children and six educators died.