Expressing concerns in an ITV interview about the Democratic presidential candidate, who he claims is monitoring him, Assange described Republican presumptive nominee Donald Trump as an "unpredictable phenomenon", but predictably, given their divergent political views, didn't say if he preferred the billionaire to be president.

He was not asked if he supported Green Party candidate Jill Stein, even though she said she would immediately pardon Wikileaks whistleblower Chelsea Manning if elected.

"We have emails relating to Hillary Clinton which are pending publication," Assange told Peston on Sunday when asked if more of her leaked electronic communications would be published.

About 32,000 emails from her private server have been leaked by Wikileaks so far, but Assange would not confirm the number of emails or when they are expected to be published.