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There have long been rumours of Kremlin heavyweights tampering with the US presidential election.

But now they could be more than just rumours.

As the FBI investigate Hillary Clinton's emails, CIA officials are allegedly looking into Carter Page – a key Trump aide – after he spent several days in Russia this summer.

(Image: GETTY) (Image: REUTERS) (Image: GETTY)

Officially he was there to give a lecture at the New Economy School but he spent more time slamming the USA and backing Putin.

The American businessman now faces a probe into his Kremlin ties.

And members of Congress have reportedly been warned that Page could be a "Russian mole".

There are even fears he discussed the possibility of the United States lifting sanctions on Russia if Trump becomes president.

A senior law enforcement official told The Washington Post: "It's being looked at."

Page has a long history with Russia and is a known Putin sympathiser.

He lived in Moscow for several years working closely with state-owned and Putin-backed oil company Gazprom.

And he has been consistently critical of Russian sanctions over Putin's action in Ukraine.

In July, he slammed his own country by saying it "criticised these regions for continuing methods which were prevalent during the Cold War period.

"Yet ironically, Washington and other Western capital have impeded potential progress through their often hypocritical focus on ideas such as democratisation, inequality, corruption and regime."

He has even been labelled a "brazen apologist for anything Moscow does" by a US official.

His position in the campaign remains unclear though.

Page was named as one of five foreign policy advisors by Donald Trump in March but his staff claim he "has never met Trump or briefed him".

Daily Star Online has contacted Mr Trump's office for comment.