WASHINGTON — Defense Secretary Robert Gates declined to say Tuesday whether he thinks it's appropriate to try self-proclaimed Sept. 11 mastermind Khalid Sheikh Mohammed in a New York civilian court, not far from the site of the attack. Prodded by Sen. John McCain to say if he agreed with Attorney General Eric Holder's choice on prosecution strategy, Gates replied that he thought Holder was better suited than he to make that decision. The Arizona Republican also pressed Gates at a Senate Armed Services Committee hearing to say whether he agreed with the Obama administration's decision to question the suspect in an attempted U.S.