From Reuters:

A senior Republican U.S. senator vowed on Wednesday to block confirmation of President Barack Obama’s nominees to head the Federal Reserve and the Department of Homeland Security if the administration does not provide more information about the 2012 attack on U.S. diplomatic facilities in Benghazi, Libya. Senator Lindsey Graham said he would put a hold on the nomination of Janet Yellen to head the Fed and Jeh Johnson to take the homeland security post as a last resort after trying repeatedly to get more information on the Benghazi matter.