His claim came in a speech he gave via a video link from the Ecuadorean Embassy in London to a news conference in Berlin marking the whistleblowing group's 10th anniversary, the Wall Street Journal reports.
As well as documents relating to the election, Assange said the website plans to publish information relating to Google, war, arms and oil, every week for the next 10 weeks. The first leak is expected to come within the next few days.
WikiLeaks released a batch of Democratic National Committee internal emails in July that led to the resignation of a number of officials including the chair, Debbie Wasserman Schultz. The leak came just as party delegates convened to nominate Hillary Clinton as the Democrats’ candidate for president.
Then in August, Assange threatened an October surprise - a news event deliberately timed to influence an election's outcome - that could damage Clinton's presidential candidacy. He told Fox News that his information was “significant” and said that the leak would include “unexpected angles.”