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.

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.”