What can Congress actually do about Russia and the election hacks?

Russian President Vladimir Putin attends a meeting with Russian businessmen in the Kremlin in Moscow, Russia, Monday, Dec. 19, 2016. (Alexei Druzhinin, Sputnik, Kremlin Pool Photo via AP)
WASHINGTON (CIRCA) - There's a battle brewing on Capitol Hill over Russia's alleged involvement in the 2016 election. Lawmakers are calling for a swift investigation, but President-elect Donald Trump and his team say there isn't enough evidence to support one.
So, what can Congress actually do about the hackings?
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