Former New York Mayor Rudolph Giuliani says Hillary Clinton's email controversy won't go away until she allows a third-party audit of her server.
And, he said, it raises concerns about national security.
Clinton used a private email address on a server she kept on her Chappaqua, New York property, and not a government email address during her four years as secretary of state.
Critics have complained her server was less secure than government servers and susceptible to hacking. Clinton said in a Tuesday press conference she never emailed classified material and that the server was on property guarded by the Secret Service.
"Isn't it going to be more secured and more cyber security when it's kept under government control?" Giuliani said Wednesday on Fox News Channel's
"The O'Reilly Factor."
Clinton is the expected frontrunner for the Democratic nomination for president in 2016. But Giuliani said the email concerns won't help her.
"She is playing around with the security of our country," he said. "That doesn't help the record of the secretary of state."