OKLAHOMA CITY (AP) - Federal prosecutors have dismissed a conspiracy charge against the former leader of the Oklahoma Senate, who still faces bribery, extortion and mail fraud charges.

Assistant U.S. Attorney Scott Williams dismissed the conspiracy count Monday against former Senate President Pro Tem Mike Morgan. Williams took the action after U.S. District Judge Robin Cauthron dropped conspiracy counts against two others involved in the case.

On Friday, Cauthron dismissed all charges against lobbyist William Skeith and about half the counts against lawyer N. Martin Stringer. The dismissed charges included conspiracy.

Morgan's attorney, David Ogle, filed a motion for a mistrial and Stringer's attorney, Drew Neville, joined in on the request. Cauthron took the motion under advisement until she hears some of the defense testimony.

Stringer and Morgan have pleaded not guilty.