A group of U.S. military advisors will begin their mission in Iraq as soon as tomorrow.

About 300 special forces members will be arriving in Baghdad as Iraqi government troops appear to be slowing the advance of Sunni militants on the outskirts of the capital city.  Militants already control several key cities in the north and east of the country.

ISIS militants have also reportedly seized a chemical weapons storage facility in Iraq that was once part of Saddam Hussein's arsenal.  (Metro Networks Inc)