Ahmed Chalabi, the onetime U.S. ally, is in the limelight again, and his actions are proving no less controversial than they did years ago.

On the eve of Iraq's parliamentary elections, Chalabi is driving an effort aimed at weeding out candidates tied to Saddam Hussein's Baath Party. Chalabi is reprising a role he played after the U.S.-led invasion -- which many critics believe he helped facilitate with faulty intelligence -- and, in the process, is infuriating American officials and some Iraqis, who suspect his motive is to bolster his own political bloc.

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