US President Donald Trump on Monday threatened countries across the world to stick to any tariff agreements they previously accepted, despite the US Supreme Court’s recent ruling striking down several of his sweeping import taxes. He also declared his intention to impose a global tariff of 15 per cent, which is a rise from the 10 per cent he had earlier announced immediately after the ruling. The court’s Friday decision struck down tariffs Trump had imposed on nearly every country using an emergency powers law.