The Supreme Court seemed likely Tuesday to block a $10 billion lawsuit Mexico filed against top firearm manufacturers in the U.S. alleging the companies have fueled cartel gun violence. Both liberal and conservative justices appeared skeptical that the claims could clear hurdles in U.

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.

A majority of the justices seemed to question Mexico’s claim that it could prove a direct chain linking arms manufacturers to drug cartel violence.