Director of National Intelligence James Clapper testifies before a Senate Armed Services Committee hearing on foreign cyber threats, on Capitol Hill in Washington, U.S., January 5, 2017. REUTERS/Kevin Lamarque The top U.S. intelligence official said on Thursday he was “even more resolute” in his belief that Russia staged cyber attacks on Democrats during the 2016 election campaign, rebuking persistent skepticism from Republican President-elect Donald Trump about whether Moscow was involved.