WASHINGTON – President Barack Obama does not plan to accept any of the Afghanistan war options presented by his national security team, pushing instead for revisions to clarify how and when U.S. troops would turn over responsibility to the Afghan government, a senior administration official said Wednesday. That stance comes in the midst of forceful reservations about a possible troop buildup from the U.S. ambassador in Afghanistan, Karl Eikenberry, according to a second top administration official.