President Donald Trump's pick of Kevin Warsh to lead the Federal Reserve shifts the focus to the Senate, where confirmation could be delayed by Republican opposition linked to a criminal probe of Fed Chair Jerome Powell. Warsh would succeed Powell, whose term expires in May, but must first be confirmed by a simple majority in the Senate, a process that typically begins with a hearing and vote in the Senate Banking Committee. Sen. Thom Tillis R-N.C., doubled down Friday, saying he will oppose the confirmatio ...