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Mike Flynn, the Donald Trump adviser who quit last night over potentially illegal phone calls with Russia, called for Hillary Clinton to be imprisoned over her emails.

Mrs Clinton broke no laws - beyond State Department IT policy - by using personal email server during her time as Secretary of State.

Flynn quit as Trump's National Security Advisor late last night, over claims he made potentially illegal calls to the Russian ambassador to the US before the President took office and lied about it to the Vice President.

(Image: REUTERS)

But during a fiery speech to the Republican National Convention in July, Flynn led a chant of "lock her up", calling on Clinton to drop out of the race because she had "put our nation's security at extremely high risk".

As the crowd of Republicans joined in with the "lock her up" chant, Flynn smiled, adding: "You guys are good. Damn right. Exactly right. There's absolutely nothing wrong with that.

"And you know why we're saying that? We're saying that because if I, a guy who knows this business, if I did a tenth of what she did, I would be in jail today."

(Image: Reuters)

Over the Christmas period - before Trump took office - Mike Flynn privately discussed US sanctions against Russia with the country's ambassador.

The phone call would appear to be in breach of the Logan Act, a law dating back to 1799, which bans unauthorised citizens from negotiating with foreign governments over national disputes.

No-one has ever been prosecuted under the Act, but the law carries a potential jail term of up to three years.

(Image: AFP)

The FBI found no evidence of criminal wrongdoing in Clinton's use of a private email server.

While the FBI said Clinton had been "extremely careless" in sending and receiving a "very small number" of classified emails using the server, they could find no evidence that Clinton's email server was ever successfully hacked.