Israel's Defense Minister Ehud Barak, center, addresses the media during a news conference at the Knesset, Israel's parliament in Jerusalem, Wednesday, May 28, 2008. Barak on Wednesday issued a tough ultimatum to Prime Minister Ehud Olmert, saying he would use his considerable power to topple the coalition government if the Israeli leader does not step aside to face corruption allegations. (AP Photo/Baz Ratner, Pool)