The U.S. Supreme Court was set on Tuesday to hear a bid by two American gun companies to throw out the Mexican government's lawsuit accusing them of aiding illegal firearms trafficking to drug cartels and fueling gun violence in the southern neighbor of the United States.

Officially, the Mexican government sued American gun manufacturers, blaming them for “aiding and abetting” the trafficking of firearms to drug cartels. But its real beef is with the Second Amendment, which prohibits the sort of sweeping gun restrictions that Mexican officials think public safety requires.

The lower appellate court ruled that Mexico had “plausibly” claimed that the manufacturers did aid and abet the illegal trafficking of guns “by passing along guns knowing that the purchasers include unlawful buyers, and making design and marketing decisions targeted towards those exact individuals.”