In this file photo taken in the summer of 2003 in New York City, American businessman Moshe Talansky, right, stands with Israeli Prime Minister Ehud Olmert. The key witness in a corruption probe of Prime Minister Ehud Olmert made a dramatic courtroom appearance Tuesday May 27, 2008, telling prosecutors that he handed cash-stuffed envelopes to the Israeli politician and suspected some of the money went to fund Olmert's fondness for fine hotels, first-class flights and luxury goods. (AP Photo/Channel 10 Israel, File)AP - Israel’s defense minister said Wednesday he would use his considerable power to topple the fragile coalition government if Prime Minister Ehud Olmert does not step aside to face corruption allegations.