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'I think we're being tested': Russian and Russia-based hacks invite response from Biden

07:29

Nicole Perlroth, cybersecurity reporter for the New York Times, talks with Rachel Maddow about ongoing ransomware attacks by Russia-based hackers, REvil, and new reports of Russian government hackers breaching the computer systems of the RNC, all of which test President Biden's warning of a response if such attacks did not stop.