http://graphics7.nytimes.com/images/dropcap/w.gif ASHINGTON, Aug. 8 — As President Charles G. Taylor edges closer to leaving Liberia, meeting one of President Bush's conditions for a greater American military role, Pentagon officials say they are firmly resisting any significant expansion of the small contingent of American forces already sent ashore. But amid rising pressure from Kofi Annan, the United Nations secretary general, and from African and European allies, Mr. Bush now faces a decision on whether to send in a larger force to help secure the port and the capital, Monrovia, and open up relief corridors. A spokesman for Mr. Annan said today...