Nick Merrill, a spokesperson for the Clinton campaign, offered up the following statement:
"An analytics data program maintained by the DNC, and used by our campaign and a number of other entities, was accessed as part of the DNC hack. Our campaign computer system has been under review by outside cyber security experts. To date, they have found no evidence that our internal systems have been compromised."
Earlier this week, the FBI revealed that it's investigating Russia's potential involvement in the email hack on the Democratic National Convention. Reuters reports that intelligence officials also believe that Russian hackers were responsible for yesterday's attack on the Democratic Congressional Campaign Committee. That would have given the hackers access to things like strategy memos and opposition research, as well as even more emails.
In his usual off-handed style, Donald Trump also called for "Russia or any other person or country" to find emails deleted by the Clinton campaign to "share them with the FBI." Essentially, he was asking foreign countries to hack the US government. The Clinton campaign was quick to push back, and Trump's campaign manager later said he wasn't asking anyone to hack Clinton's emails.