Conservative media's false claim that Bill Clinton banned guns on military bases is back in the news after being repeated by Republican presidential candidate Donald Trump.

Following the mass shooting at Washington, D.C.'s Navy Yard facility in 2013, conservative media sought to pin blame on President Clinton by seizing on a March 1993 Army regulation that they claimed banned the carrying of guns on military bases. In fact, the 1993 regulation came from a 1992 directive issued under George H.W. Bush that became “effective immediately” in February of that year. (The Bush directive actually allows guns to be carried on military bases under a substantial number of circumstances and military experts have said more permissive gun carrying rules are a bad idea.)

Although this falsehood led to the National Rifle Association's news show issuing a rare correction, it's been given new life after being repeated by Trump and subsequently trumpeted by the right-wing media echo chamber.

In a July 7 interview with Ammoland.com, Trump was asked (emphasis original), “Would you have a problem allowing our military bases to set their own polices with regard to personal weapons and do away with the 'Gun Free Zones' death trap?”

In his response, Trump said, “President Clinton never should have passed a ban on soldiers being able to protect themselves on bases” (emphasis and brackets original):

Donald Trump:

"[gun free zones] No, not optional. As Commander-in-Chief, I would mandate that soldiers remain armed and on alert at our military bases.

President Clinton never should have passed a ban on soldiers being able to protect themselves on bases. America's Armed Forces will be armed.

They will be able to defend themselves against terrorists. Our brave soldiers should not be at risk because of policy created by civilian leadership. Political correctness has no place in this debate."

Trump's false claim about Clinton was then repeated in conservative media. The Washington Examiner's Paul Bedard reported,“Pistol-packing GOP presidential candidate Donald Trump ripped a policy implemented by former President Bill Clinton making military bases 'gun free zones,' declaring that as president bases would no longer be defenseless against terror attacks.”

The comment was also promoted by Breitbart.com's AWR Hawkins, the conservative writer who made the claim on the NRA's news show following the Navy Yard shooting, leading to their correction.

The NRA's magazine, America's 1st Freedom, praised Trump's vow that he would change military base policies in a July 14 post that excised Trump's false claim about Clinton.

This is not the first time that Trump has campaigned on falsehoods invented by conservative media. During a July CNN appearance, Trump falsely claimed that there are 34 million undocumented immigrants in the United States, a vastly overstated and false figure that had previously circulated in conservative media.