Biden was expected to hold talks with Iraqi leaders during a period of political deadlock, almost six months after an inconclusive election in March, over forming the country's next government.
His visit comes at a time when Iraq is on high alert for attacks by insurgents after a series of bombings that killed dozens of people and underscored the fragility of Iraq's recent security gains.
(Reporting by Thaier al-Sudani; Editing by Michael Christie)
