Donald Trump's love of retribution migh complicate his dream of naming a n Federal Reserve chairman. Yesterday, Trump officially announced that the former Fed governor, Kevin Warsh, would be his pick to succeed Jerome Powell as the chair in May. Warsh has built a reputation as a Fed critic who thinks the central bank has drifted beyond its mandate, but Trump's constant targeting of Powell, the current Fed chair, is putting Warsh's Senate confirmation in question.Republican Senator Tom Tillis, who sits on bo ...