Senator Rand Paul (R-Ky.) threatened to block President Obama's nomination of Janet Yellen for the new Federal Reserve Chair. "There's no time to waste. Right now, the U.S. Senate is preparing to debate and confirm the new Obama nominee to chair the Federal Reserve. I say not so fast. I say vote no on a new Fed chairman without a vote on my Audit the Fed bill," Paul said in a video produced for Campaign for Liberty.