President Biden will raise the issue of massive cyber attacks with Russian President Vladimir Putin at their summit in mid-June.
White House Press Secretary Jen Psaki told reporters the hacks pose a serious threat to U.S. cyber-security.
U.S. intelligence officials believe Russia is a key suspect in some of the hacks.
Putin has publicly denied involvement. Psaki said it's one of a number of hot topics that Biden will bring up with Putin.
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