Mark Steyn said on "Hannity" tonight that Hillary Clinton's emails show that U.S. allies, such as former U.K. Prime Minister Tony Blair, were aware that she was using a private email address during her time as secretary of state.

"It's obvious that the good guys, the allies, knew the problems with her server, so we can conclude that the Russians and the Chinese and the mullahs in Tehran and all the other people did as well," Steyn said.

He said the question now is what those foreign governments will do with that information, which could be damaging to Clinton or even make her susceptible to blackmail.

"I think this is devastating to Hillary Clinton's campaign," Steyn said, pointing out that the only two explanations for her private server are deviousness or ignorance.

"This is a disaster for her, because it goes to competence, it goes to judgment, it goes to all the most basic issues you ask of a presidential candidate."

Watch the "Hannity" clip above.

You might also be interested in...

New Calls for Gun Control After WDBJ Attack: Dana Loesch & Bill Burton Debate

Trump: 'Obama Hasn't Unified the Country, He's Been a Divider'

Obama: U.S. Gun Deaths Dwarf Terrorism Deaths

Watch WDBJ's Heartbreaking Moment of Silence for Slain Colleagues