U.S. presidential candidate Hillary Clinton said on Saturday that she did not use a private email account to send or receive classified information while she was secretary of state, in response to a government inspector's letter this week. "I did not send nor receive anything that was classified at the time," Clinton said at a campaign stop in Iowa. The email controversy has dogged Clinton's bid for the presidency, fuelling worries that the frontrunner for the Democratic nomination has tried to sidestep transparency and record-keeping laws. At least four emails from the private email account that Clinton used while secretary...