Russia cyber activity poses major threat to US - Intelligence chief
Top officials appeared on Capitol Hill on Thursday morning before the Senate Armed Services Committee hearing on "Foreign Cyber Threats to the United States", chaired by Sen John McCain.
"Russia is a full-scope cyber actor that poses a major threat to US government, military, diplomatic, commercial, and critical infrastructure," US intelligence chiefs said in a joint statement.
Director of National Intelligence James Clapper expanded on the scope of the "multifaceted campaign" against the US by Russia. He later added that there were "multiple motives" for the cyber-attack.
"The hacking was only one part of it," he said. "It also entailed classical propaganda, disinformation and fake news."
Mr Clapper added: "We have no way of gauging the impact ... it had on the choices the American electorate made. Whether or not that constitutes an act of war is a very heavy policy call that I don’t believe the intelligence community should make."
Officials are expected to release a declassified report of their findings to the public on Monday. Mr Obama ordered the full report last month for delivery before he leaves office on 20 January.
The hearing comes a week after President Barack Obama announced sanctions on two Russian intelligence agencies and expelled 35 Russian diplomats
According to Mr Clapper, the sanctions were a "consensus inter-agency view".