Donald Trump is the first president to try to use the U.S. Justice Department to oust a sitting Federal Reserve chair. - Getty Images A criminal investigation into the chairman of the Federal Reserve? Grand jury subpoenas handed out to Fed officials by agents of the U.S. Justice Department? The latest events at the Fed, revealed over the weekend by Fed Chair Jerome Powell, have no precedent and have shocked even many political veterans. The Justice Department says the probe is related to the refurbishme ...