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US President George W. Bush (R) shakes hands with Iraqi Prime Minister Nouri Al-Maliki (L) during meetings at Al-Asad Air Base in Anbar Province, Iraq, 03 September 2007. The conclave comes just days before Petraeus and US Ambassador Ryan Crocker go before a sceptical Congress to report on whether a buildup in US forces has succeeded in setting the conditions for political reconciliation. AFP PHOTO/Jim WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)

US President George W. Bush (R) shakes hands with Iraqi Prime Minister Nouri Al-Maliki (L) during meetings at Al-Asad Air Base in Anbar Province, Iraq, 03 September 2007. The conclave comes just days before Petraeus and US Ambassador Ryan Crocker go before a sceptical Congress to report on whether a buildup in US forces has succeeded in setting the conditions for political reconciliation.   AFP PHOTO/Jim WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)