U.S. Supreme Court justices signaled sympathy on Tuesday toward 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.

Justices expressed deep skepticism Tuesday about an unusual lawsuit by the Mexican government that seeks to hold major U.S. firearms manufacturers accountable for gun violence in that country.

As President Donald Trump pressures Mexico to address the flow of migrants and drugs heading north into the United States, the Supreme Court is set to hear arguments Tuesday in a major appeal about one thing that’s crossing the border toward Mexico: guns.