Senate Banking Committee Chairman Richard Shelby (R-Ala.), may hold up President Obama’s nominees for the Federal Reserve Board of Governors over the president’s lack of action in nominating a vice chairman of supervision to the Fed. The vice chairman’s role is to ensure accountability of the central bank’s oversight of the largest financial firms. But the position has stood empty for five years and Hill Republicans say the vacancy prevents Congress from exercising oversight of the Fed. The two Federal Reserve Board of Governors nominees awaiting confirmation are University of Michigan economist Kathryn Dominguez and former Bank of Hawaii Chief Executive Allan Landon.