Members of congress are demanding answers over claims that Russia attempted to influence the U.S. presidential election with several high-profile hacks. U.S. intelligence agencies are confident that the Kremlin was involved, but incoming president Donald Trump remains skeptical.  

As they prepare to investigate, here’s some questions lawmakers should be asking to help them understand and respond to these hacks.  

What evidence do we have proving Russia’s involvement?

Attribution in any hack can be incredibly difficult, as Trump noted in a tweet, but cybersecurity experts say they have technical evidence showing that Democratic groups and figures were at the very least hacked with spear phishing emails and hard-to-detect malware from two suspected Russian hacking teams.

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