BAGHDAD — The Iraqi Parliament passed a bill on Saturday that would allow some former officials from Saddam Hussein’s party to fill government positions but would impose a strict ban on others. The legislation is the first of the major so-called political benchmark measures to pass after months of American pressure for progress. The measure, which is expected to be approved as a law by the presidential council, was described by its backers as opening the door for the reinstatement of thousands of low-level Baath Party members barred from office after the 2003 invasion. Since then, the Bush administration has...