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By William Maclean MANAMA (Reuters) - The United States will send 200 additional military personnel including special forces to the campaign against Islamic State in Syria to create a "tornado" of pressure against the group's Raqqa hub, U.S. Defense Secretary Ash Carter said on Saturday, Carter, speaking in Bahrain to regional security chiefs, twinned the announcement with a call on Middle East allies to do more for their own defense, a sore topic with some Gulf states who resent being seen by Washington as military "free riders". The arrival of the 200 additional forces in Syria, joining 300 special forces already there backing local allies, would bring to bear the "full weight of U.S. forces around the theater of operations like the funnel of a giant tornado", Carter said.
Exxon Mobil Corp Chief Executive Officer Rex Tillerson emerged on Friday as President-elect Donald Trump's leading candidate for U.S. secretary of state, a senior transition official said. Trump appears to be in the final days of deliberations over his top diplomat with an announcement possible next week. Tillerson's favored status was revealed as former New York Mayor Rudy Giuliani formally withdrew from consideration for secretary of state.