(CNN) WikiLeaks founder Julian Assange is boasting about how his group's release of hacked Democratic National Committee emails is affecting the US presidential election -- and says it has unreleased information about Hillary Clinton's campaign.

"We have more material related to the Hillary Clinton campaign," Assange told CNN's Anderson Cooper on "Anderson 360" Friday night. "That is correct to say that."

Assange has been coy about how WikiLeaks came into possession of internal Democratic party cyber information. The FBI and Justice Department are investigating a computer hack of Democratic nominee Clinton's presidential campaign in addition to its examination of intrusions of other Democratic Party organizations, two law enforcement officials told CNN.

The revelation comes just days after the leak of thousands of Democratic National Committee emails -- US officials allege Russian hackers -- prompted major turmoil within the party, causing the abrupt resignation of its chairwoman, Rep. Debbie Wasserman Schultz.

Assange said release of the information was timed to coincide with the start of the Democratic National Convention.

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