The military commander in Iraq, Gen. David Petraeus, is to deliver a report to Congress on Monday that could be the most consequential testimony by a wartime commander in more than a generation. What the country desperately needs is an honest assessment of the war and a clear strategy for extricating American forces from the hopeless spiral of violence in Iraq.

President Bush, however, seems to be aiming for maximum political advantage — not maximum clarity on Iraq’s military and political crises, which cannot be separated from each other. Mr. Bush, we fear, isn’t looking for the truth, only for ways to confound the public, scare Democrats into dropping their demands for a sound exit strategy, and prolong the war until he leaves office. At times, General Petraeus gives the disturbing impression that he, too, is more focused on the political game in Washington than the unfolding disaster in Iraq. That serves neither American nor Iraqi interests.

Mr. Bush, deeply unpopular with the American people, is counting on the general to restore credibility to his discredited Iraq policy. He frequently refers to the escalation of American forces last January as General Petraeus’s strategy — as if it were not his own creation. The situation echoes the way Mr. Bush made Colin Powell — another military man with an overly honed sense of a soldier’s duty — play frontman at the United Nations in 2003 to make the case that Iraq had weapons of mass destruction. Mr. Bush cannot once again subcontract his responsibility. This is his war.

General Petraeus has his own credibility problems. He overstepped in 2004 when he published an op-ed article in The Washington Post six weeks before the election. The general — then in charge of training and equipping Iraq’s security forces — rhapsodized about “tangible progress” and how the Iraqi forces were “developing steadily,” an assessment that may have swayed some voters but has long since proved to be untrue.