In his first public remarks since the conclusion of his time as Federal Reserve chair, Jerome Powell has issued a blunt warning that the central bank is undergoing a "stress test" and its credibility is on the line. The big picture: While Powell's remarks Sunday evening, in accepting the John F. Kennedy "Profiles in Courage" award, do not mention the Trump administration's attempts to undermine Fed independence specifically, the meaning of his words is plain. Those include a criminal investigat