President Joe Biden said on Wednesday he will begin withdrawing US troops from Afghanistan on May 1 to end America's longest war, rejecting calls for US forces to stay to ensure a peaceful resolution to that nation's grinding internal conflict.<br /><br />In a White House speech, Biden acknowledged that US objectives in Afghanistan had become "increasingly unclear" over the past decade. He set a deadline for withdrawing all 2,500 U.S. troops remaining in Afghanistan by Sept. 11, exactly 20 years after al Qaeda's attacks on the United States that triggered the war.<br /><br />But by pulling out without a clear victory, the United States opens itself to criticism that a withdrawal represents a de facto admission of failure for American military strategy.<br />
