Long-term U.S. government debt sells off, with yields rising, and the dollar weakens as markets reopen amid renewed risks of a trade war with Europe over Greenland.The 30-year Treasury yield approaches 5% and the 10-year is at 4.3%, while the two-year hovers around flat.The U.S. Supreme Court is yet to rule on the legality of Trump's sweeping levies. The Court will hear arguments tomorrow on whether Trump can fire Fed governor Cook, with high stakes for the central bank's independence. ...