premise: Officially US policy is to support a unified Iraq. Washington would not drop the goal, but instead would let the Iraqis take leadership in reconciliation efforts, the Post reported.
  Sunnis, favored during Saddam Hussein's regime and for centuries the backbone of the ruling elite and middle class, make up about 20 percent of Iraq's population.
  "We'll be in Iraq until the job is complete," Bush said Thursday after talks in Amman, Jordan, with embattled Iraqi Prime Minister Nuri al-Maliki.
  "There's a lot of speculation that these reports in Washington mean there's going to be some kind of graceful exit out of Iraq. We're going to stay in Iraq to get the job done, so long as the government wants us there," he said.
   Why does the US want Iraqis to take leadership in reconciliation efforts?
hypothesis: Officially US policy is to support a unified Iraq