For months the National Rifle Association and Fox News have been pushing the fringe conspiracy theory that a proposed United Nations Arms Trade Treaty puts Second Amendment rights at risk. Now Mitt Romney is bringing that claim to the presidential campaign, parroting it on the stump.

As ThinkProgress reported, during a town hall event in Ohio yesterday, Romney said:

ROMNEY: Turning to the United Nations to tell us how to raise our kids, or whether we can have the Second Amendment rights that our Constitution gave us, I mean, that is the wrong way to go, right? Do not cede sovereignty. I'm happy to talk there. I'm not willing to give American sovereignty in any way, shape or form to the United Nations or any other body. We are a free nation. We fought for freedom and independence. We are going to keep freedom and independence.

But contrary to the conspiracy spun by the NRA and Fox and now repeated by Romney, the ATT only seeks to regulate the international import and export of conventional and small arms, and is not aimed at domestic gun regulation governed by U.S. sovereignty. Furthermore, the U.S. Department of State has stated that it will not enter into any treaty that contains “restrictions on civilian possession or trade of firearms otherwise permitted by law or protected by the U.S. Constitution. There will be no dilution or diminishing of sovereign control over issues involving the private acquisition, ownership, or possession of firearms, which must remain matters of domestic law.”

The idea that the United Nations can determine “whether we can have the Second Amendment rights that our Constitution gave us” germinated at the National Rifle Association in the mid-1990s when CEO Wayne LaPierre began to speciously warn of “global gun grabbers.”

But despite an utter lack of explanation by its pushers about how the U.N. could use a treaty to trump the United States Constitution, the conspiracy has survived over the years and has reached its zenith as ATT negotiations are finalized.

In the first week after negotiations began on July 2, Fox News featured seven appearances by opponents of the treaty compared to zero appearances by proponents. Instead of offering a cogent critique of the ATT, each guest has instead delved into conspiracy theory. Indeed, there are stark similarities between Romney's Wednesday warning and the commentary of Fox News contributor Dick Morris who claimed on July 5 that the ATT “will take the gun control issue away from the Congress and give it to the United Nations as part of an international treaty.”

Romney's ATT comments were not the first time that Fox News served as the conduit between factually vacant right wing theories and the Republican presidential campaign. On Monday, Fox News deceptively edited and then hysterically promoted comments made by President Obama about small business owners. The false narrative found its way into Romney's campaign by Tuesday afternoon.