(CNN)Wikileaks founder Julian Assange said Tuesday his whistleblowing website might release "a lot more material" relevant to the US electoral campaign. Assange was speaking in a CNN interview following the release of nearly 20,000 emails stolen from the Democratic National Committee by suspected Russian hackers. However, Assange refused to confirm or deny a Russian origin for the mass email leak, saying Wikileaks tries to create ambiguity to protect all its sources.