Sen. John Kerry (D-MA) plans to introduce an amendment to the fiscal year 2007 defense authorization bill directing the president to reach an agreement with the Iraqi government for the withdrawal of U.S. combat troops in the war-torn country by the end of this year. The amendment would leave in place only U.S. "forces that are critical to completing the mission of standing up Iraqi security forces," according to the text of the measure, released by the senator today. The...