U.S. Federal Reserve Vice Chair Yellen testifies on her nomination to be the next chairman of the Fed during a Senate Banking Committee confirmation hearing in WashingtonWASHINGTON (Reuters) – The Democratic-led U.S. Senate may just vote to confirm Janet Yellen as chair of the Federal Reserve in a rare weekend session on Saturday, an aide said on Thursday. The Senate seems certain to verify Yellen to exchange Ben Bernanke, whose time period expires subsequent month. Democrats had hoped to vote on Yellen on Thursday or Friday, but have to this point been unable to succeed in a wanted time settlement with Republicans to hurry things up, an aide mentioned. (Reporting by using Thomas Ferraro; Editing via Chizu Nomiyama)