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The U.S. intelligence chief isn't changing his assessment of Russia's role in high profile election-related cyberattacks as a Senate Committee opens an investigation.

FOX's Jared Halpern has more from Capitol Hill:

Director of National Intelligence James Clapper says he and his colleagues stand more resolutely on the strength of an October statement blaming top Russian officials for directing email hacks of the Democratic party:

(Clapper) "Whether or not that constitutes an act of war I think is a very heavy policy call."

A call Clapper says the intelligence community should not make:

(Clapper) "But it certainly, would carry, in my view, great gravity."

President Obama has received a full report on Russian and other foreign meddling in the election. Clapper says an unclassified version will be released next week.

On Capitol Hill, Jared Halpern, FOX News.

Follow Jared Halpern on Twitter: @JaredHalpern

U.S. Intelligence officials say they're convinced Russia tried to interfere in the Presidential election.

FOX's Rachel Sutherland reports from Washington:

Director of National Intelligence James Clapper says Russia has tried to meddle in elections before, but U.S. officials have never encountered a more aggressive or direct campaign to interfere in our election process than during the 2016 campaign:

(Clapper) "Russia has clearly assumed an even more aggressive cyber posture by increasing cyber espionage operations, leaking data stolen from these operations and targeting critical infrastructure systems."

Clapper told the Senate Armed Services committee a declassified report on Russian election interference will be released next week.

Committee Republican Chair John McCain stressed the intelligence review is not intended to call into question the outcome of the Presidential election.

In Washington, Rachel Sutherland, FOX News.

Follow Rachel Sutherland on Twitter: @SutherlandFOX