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It comes after the CIA released a statement that Russian hackers helped Donald Trump win the election and that the intelligence group had a “high confidence” that Kremlin officials were involved in the scandal. Republican McCain said: “Whether they intended to interfere to the degree that they were trying to elect a certain candidate, I think that's a subject for investigation.

GETTY John McCain has attacked Vladimir Putin

The facts are stubborn things. They did hack into this campaign John McCain

"But the facts are stubborn things. They did hack into this campaign." The 80-year-old, who has distanced himself from Trump during the Presidential campaign, said Congressional involvement was needed to get to the bottom of the hacking claims. McCain also pointed to the fact that Russians had already used their influence to rig other elections.

GETTY Trump has dismissed speculation Russia influenced the Presidential elecion

Donald Trump's most memorable tweets as president Fri, April 21, 2017 Donald Trump's most memorable tweets since elected as President of the United States Play slideshow REUTERS 1 of 22 Donald Trump tweets his way through presidency

McCain said: “The facts are there about Russia's behaviour. "What we're going to do in the meantime is going to have a subcommittee on the armed services committee...and we'll go to work on it. We'll go to work immediately. Because the issue of cyber is not a static issue."

GETTY John McCain (right) said there must be an investigation into the claims