BAGHDAD — Iraq’s government Monday ruled out allowing U.S. combat troops to remain in Iraqi cities after the June 30 deadline for their withdrawal, despite concern that Iraqi forces cannot cope with the security challenge following a resurgence of bombings in recent weeks. Asking U.S. forces to stay in the cities, including volatile Mosul in the north, would be embarrassing for Iraq’s prime minister, who has staked his political future on claims that the country has turned the corner in the war against Sunni and Shiite extremists. The departure of heavily armed combat troops from bases inside the cities is important psychologically to many Iraqis, who are eager to regain control of their country after six years of war and U.S. military occupation. U.S. officials played down the Iraqi decision, with Pentagon spokesman Bryan Whitman saying it’s up to the Iraqi government to request an extension of the U.S. presence in the cities and ‘we intend to fully abide by’ terms of the security agreement. The chairman of the Joint Chiefs of Staff, Adm. Mike Mullen, told reporters Monday that violence had not risen to a level that would force a change in the withdrawal schedule. […]