April 2016: Hacking attacks on the DNC and the Clinton campaign are first discovered.

On June 14, 2016, McClatchy Newspapers will report that a hacking attack on the DNC [Democratic National Committee] is discovered “in late April 2016, after staffers noticed unusual activity on the DNC’s computer network.” (McClatchy Newspapers, 6/14/2016) 

On June 21, 2016, Bloomberg News will report, “The Clinton campaign was aware as early as April that it had been targeted by hackers with links to the Russian government on at least four recent occasions, according to a person familiar with the campaign’s computer security.” (Bloomberg News, 6/21/2016)

In late July 2016, it will be reported that the FBI warned the Clinton campaign in March 2016 that it was the target of hacking attempts, but the campaign refused to help the FBI stop them.