The top U.S. commander in Iraq has submitted a plan to the Pentagon for withdrawing troops in Iraq, according to a senior defense official. Gen. George Casey submitted the plan to Secretary of Defense Donald Rumsfeld. It includes numerous options and recommends that brigades -- usually made up of about 2,000 soldiers each -- begin pulling out of Iraq early next year, CNN reported. The proposal comes as tension grows in both Washington and Baghdad following a call by a senior House Democrat to bring U.S. troops home and the deaths of scores of people by suicide bombers in two Iraqi cities. House Republicans were looking for a showdown Friday after Rep. John Murtha, a Pennsylvania Democrat and well-respected Vietnam veteran, presented a resolution that would force the president to withdraw the nearly 160,000 U.S. troops in Iraq "at the earliest predictable date." Murtha on Thursday called the administration's management of the conflict "a flawed policy wrapped in illusion" that is "uniting the enemy against us." "It's time to bring the troops home," he said. Republicans were looking to lock horns with Democrats after Murtha's remarks. Rather than distancing themselves from Friday's resolution, House majority leader Roy Blunt, R-Missouri, welcomed a debate and vote, forcing Democrats to stand alongside Murtha or go on record against the withdrawal. Meanwhile, at least 90 people were killed in two suicide bombings in Iraq, according to hospital officials. The U.S. military put the casualties at 150, without giving a breakdown.