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Democratic U.S. presidential candidate Hillary Clinton denied she sent or received classified email on her private server. She is pictured here speaking to supporters at the home of Sean and Vidyha Bagniewski in the Beaverdale area of Des Moines, Iowa July, 25, 2015. Reuters/Brian C. Frank

WINTERSET, Iowa (Reuters) - U.S. presidential candidate Hillary Clinton said on Saturday she did not send or receive classified information on a private email account while she was secretary of state.

"I did not send nor receive anything that was classified at the time," Clinton told reporters at a campaign event.

Clinton, the front-runner for the 2016 Democratic presidential nomination, has been criticized for using a private email account during her years as America's top diplomat.

Hillary Clinton