WASHINGTON (AP) — President Obama is preparing to tap George Mitchell, the former Senate Democratic leader, for a top diplomatic post for the Middle East.

 

 Officials told The Associated Press today that the new administration is preparing to announce the appointment shortly. The officials spoke on condition of anonymity because they have not been authorized to disclose it publicly.

 

 Mitchell would assist Hillary Rodham Clinton, Obama’s pick for secretary of State. The Senate was expected to vote on Clinton’s nomination later today.

  The parameters of Mitchell’s role were not immediately clear. Recent reports said Dennis Ross, longtime U.S. negotiator, would be named an adviser to Clinton. Mitchell, 75, took on difficult diplomatic assignments during President Bill Clinton’s presidency.