The Last Jihad by Joel C. Rosenberg

Think I'd try this author one more time. PW Jon Bennett is a top Wall Street strategist turned senior White House advisor. But nothing has prepared him for the terror that he will face. Saddam Hussein dispatches his top hit men to assassinate the President of the United States. Iraqi terrorists spread carnage throughout London, Paris, and Riyadh...and the Butcher of Baghdad has a nuclear ace in his hand that he has not yet played. Only a solid Arab-Israeli coalition against Iraq can keep the U.S. and other Western nations from certain devastation. And only Bennett and his beautiful partner, Erin McCoy, can make that happen. Their secret project - a billion dollar oil deal off the coast of Gaza - could be the basis for an historic peace treaty and enormous wealth for every Israeli and Palestinian. But just before the treaty can be signed, Israeli commandos foil an Iraqi scud missile launch, recovering a nuclear warhead and evidence that the next attack will level Washington, New York, and Tel Aviv.
Now, the Israeli prime minister gives the American President an ultimatum: melt down Baghdad within one hour...or Israel will do it herself.