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“Conditions are deteriorating, and more lives are being lost every day,” Mr. Reid said. “Some would rather wait until September before forcing the president to change course. If there were real signs of progress or real reason for hope, that might make sense.”

But Senate Republican leaders said taking action now would undermine the armed forces in Iraq, particularly since the final wave of the recent troop “surge” was deployed only about three weeks ago.

c This article is based in part on wire service reports.