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.

Do U.S. arms manufacturers bear responsibility for the guns fueling cartel violence in Mexico? Mexico is arguing that case before the Supreme Court.

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.