NEW : President Mubarak says a transition in Alexandria must begin now . NEW : Protesters and supporters of the Tunisian president clash in Alexandria . Barack Obama 's position will only `` extend the agony , '' an opposition leader says . Scobey leader : Opposition should weigh speech before responding .
NEW : President Barack Obama says a transition in Egypt must begin now . NEW : Protesters and supporters of the Egyptian president clash in Alexandria . Mubarak 's position will only `` extend the agony , '' an opposition leader says . Arab League leader : Opposition should weigh speech before responding .