The Obama administration, facing a subpoena threat from Congress, will not share information that could compromise its prosecution of the suspected gunman in last year's Fort Hood shooting, Defence Secretary Robert Gates said on Friday. Two U.S. senators vowed on Thursday to subpoena the Obama administration next week unless it produces information sought in a congressional investigation of last year's rampage at the Texas military base, which killed 13 soldiers. They said the Justice and Defence departments had until Monday to provide the information or face legal action. Gates, speaking to reporters after attending a Caribbean security conference in Barbados,...