Leading Republicans are vowing to hit back against Russia, by drafting tougher sanctions, over a string of cyber-attacks during last November's presidential race.
Senator John McCain says he 'has no idea' what President-Elect Donald Trump is likely to do on Russia, because the two 'haven't spoken'.
Fresh divisions over Russia, between the Republican leadership, and Donald Trump, surfaced amid intelligence briefings on Capitol Hill.
Nina-Maria Potts reports:
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