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Sen. Rand Paul may put Janet Yellen Fed nomination on hold, source tells CNBC

Sen. Rand Paul is threatening to put a hold on the nomination of Janet Yellen to chair the Federal Reserve, a source close to the Kentucky Republican said Friday.

Paul is insisting on a vote on his Fed transparency bill, and has informed Senate leadership of his intentions, the source said.

"As part of Senate consideration of the Janet Yellen nomination to be Chair of the Federal Reserve, I will request a vote on my bipartisan Federal Reserve Transparency Act, S. 209. The American people deserve transparency from the federal reserve and the federal government as a whole," Paul said in a statement following the reports.

A Senate Democratic aide told CNBC on Friday morning that the ability of Paul to single-handedly block the nomination "should not be overstated." Paul would need 40 other senators to back his effort to block Yellen's nomination; otherwise, Senate leadership could defeat his blocking effort.

Although hearings have not yet been scheduled, the aide said the leadership at this point is confident the nomination will succeed.

Paul intends to formally put the hold in place next week, once the Senate is back in session, the source added.

The senator's bill would mandate a complete audit of the Federal Reserve.

According to Paul's website, his bill is a version of legislation advocated by his father, the former Texas congressman and presidential candidate Ron Paul.

—By CNBC's Steve Liesman. Follow him on Twitter @steveliesman.


Rand Paul says 'audit the Fed'