The United States government has weighed in on the legal battle between Argentina and a group of New York hedge funds, lending its support to the struggling country and dealing a setback to the investors. In a “friend of the court” — or amicus curiae — brief filed on Wednesday at the United States Court of Appeals for the Second Circuit in New York, the Justice Department said it supported an American federal judge’s decision to lift an injunction that had prevented Argentina from raising new money in the bond markets or paying its creditors. The move comes during President...