NEW : Sen. Joe Manchin , D-West Virginia , called Tuesday for a `` substantial and responsible reduction '' in troop levels , arguing the war has become fiscally irresponsible and more resources need to be focused on domestic problems . Senior administration officials say planning for the drawdown began in January . Romney , Huntsman question Obama 's decision . Comment: The withdrawal will begin next month , with 10,000 troops leaving Afghanistan this year .
NEW : Senior administration officials say planning for the drawdown began in January . Romney , Huntsman question Obama 's decision . Comment: The withdrawal will begin next month , with 10,000 troops leaving Afghanistan this year .