WASHINGTON (Reuters) - A Senate committee approved on Thursday President Barack Obama’s pick to lead U.S. and international forces in Afghanistan. Lieutenant General John Nicholson’s approval by the Senate Armed Services Committee came during a hearing with the outgoing U.S. commander in Afghanistan, General John Campbell. Nicholson said in testimony to the committee last week that he aimed to review a plan that would cut American troop levels by nearly half by the start of next year, as he acknowledged deteriorating security in the country. 