Bernie Sanders and his supporters have been claiming the 2016 presidential election is “rigged” for months— now, Democratic National Committee documents leaked by a hacker warrant speculation into the merit of their claim.

“Guccifer 2.0,” the hacker who claimed responsibility for the security breach, intercepted documents sent to the DNC on May 26, 2015 and posted them online earlier this week. The documents trumpet Hillary Clinton as the presumptive Democratic nominee a full year before she was announced as such and a month after Sanders launched his presidential campaign.

The documents list ways to counter the GOP presidential field and aimed to position Clinton for the general election by providing “a contrast between the GOP field and HRC.”

One memo urges the DNC to “use specific hits to muddy the water around ethics, transparency, and campaign finance attacks on HRC.”

Another memo advises the DNC to “utilize reporters to drive a message” and to leave “no fingerprints” so the public believes the message is coming from an unbiased third party and not the committee pushing their own agenda.

The DNC blamed the hack on the Russian government, but didn’t vehemently deny or affirm the authenticity of the documents.

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“Our experts are confident in their assessment that the Russian government hackers were the actors responsible for the breach detected in April, and we believe that today’s release and the claims around it may be part of a disinformation campaign by the Russians,” the DNC statement read, adding that it will “continue to monitor our systems closely.”

Another document revealed was a 237-page report listing ways to take down presumptive GOP nominee Donald Trump. A cybersecurity firm hired by the DNC confirmed the breach and attributed it to “sophisticated adversaries” with ties to Russian intelligence, according to NY Daily News.

Guccifer 2.0 also released financial records of donations made to the DNC, though the committee denies the records were in any way breached.

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The hacker allegedly gave thousands of additional documents to Wikileaks, an international journalistic organization known for exposing secret government documents.

To read about how Democrats are bailing on DNC leader Debbie Wasserman Schultz, click here.