A major U.S. newspaper is reporting that Robert Blackwill, President George W. Bush's policy advisor on Iraq, will resign. The Washington Post says Mr. Blackwill told colleagues of his resignation on Friday.

Mr. Blackwill has guided the Bush administration's policy on Iraq since the summer of 2003. At that time, U.S. Defense and State Department officials were at odds over the direction of Iraq. Mr. Blackwill is credited with reshaping the administration's policy by focusing on an end to the U.S.-led occupation and the establishment of an interim Iraqi government.

The Post says Mr. Blackwill's departure ends speculation that he could replace Condoleezza Rice as National Security Advisor during President Bush's second term in office.