WASHINGTON - At a precarious moment in the war in Afghanistan, President Barack Obama prepared to hear his top war commander explain biting published complaints about the commander in chief and his aides. Even before their showdown, the White House's rebuke of Gen. Stanley McChrystal suggested it would be hard for him to save his job. Ahead of his meeting with the president, McChrystal arrived at the Pentagon for meetings, including once scheduled with Defense Secretary Robert Gates. On his arrival, he denied to NBC News that he's offered his resignation. "Come on, you know better than that. No!"