How Did an Al Qaeda Leader in Iraq Become an American Citizen Living in Phoenix?

In January the FBI arrested Ali Yousif Ahmed Al-Nouri in Phoenix, Arizona after a warrant was issued for his arrest. Al-Nouri was an Al Qaeda leader in Iraq and was on the run for the murder of Iraqi police officers in Al-Fallujah. 

"According to the information provided by the Government of Iraq in support of its extradition request, Ahmed served as the leader of a group of Al-Qaeda terrorists in Al-Fallujah, Iraq, which planned operations targeting Iraqi police.  Ahmed and other...