Tonight on Special Report with Brit Hume:

President Bush will offer Saddam Hussein an ultimatum -- step down or face war. Saying "the diplomatic window has closed," White House spokesman Ari Fleischer announces that the president will address the nation at 8 p.m. EST. White House officials tell FOX News that Bush will give Saddam less than a week to leave Iraq.

Guest preview: FOX News contributor Dennis Ross, former Middle East envoy to two presidents, tells us what's next in the situation with Iraq.

Plus:

• The United States, Britain and Spain announce they will not seek a vote on a Security Council resolution that authorizes force against Iraq, blaming a threatened French veto for their decision.

• The United States has advised the U.N. nuclear agency to begin pulling its inspectors out of Iraq.

• Prime Minister Tony Blair calls an emergency Cabinet meeting on the crisis in Iraq, with a decision on military action drawing close.

• The Palestinian parliament rebuffs Yasser Arafat's attempt to dilute the authority of a future prime minister, keeping reforms sought by Washington alive for now. In the Gaza Strip, 10 Palestinians, including a 4-year-old girl, are killed in two Israeli raids.

Details on these stories and more on Special Report with Brit Hume.
— Guests and topics are subject to change