BAGHDAD -An anti-American cleric is urging his followers to stop attacking U.S. troops in Iraq so that their withdrawal from the country isn't slowed down, a call meant to ramp up pressure on Baghdad's political leaders who are considering asking some American forces to stay. In a statement posted on his website, Shiite cleric Muqtada al-Sadr told his militias to halt attacks against U.S. forces till the withdrawal is finished at the end of the year as required under a security agreement between Washington and Baghdad. "Out of my desire to complete Iraq's independence and to finish the withdrawal of...