Justices of the U.S. Supreme Court mulled dozens of questions Tuesday about the fate of a Turkish state-owned bank after charges were brought against the entity for allegedly laundering billions of dollars and lying to U.S. regulators.

Turkiye Halk Bankasi A.S., AKA Halkbank, is 75% owned by the state-run Turkish Wealth Fund. The U.S. Attorney’s Office of the Southern District of New York accused it of turning $20 billion in Iranian oil and gas funds into gold, which was then used to fund terrorist actions around the world all while skirting American banking laws. A Southern District of New York district judge refused to dismiss the charges and the U.S. Court of Appeals for the Second Circuit affirmed that denial of dismissal.