Julian Assange told a U.S. congressman on Tuesday he can prove the leaked Democratic Party documents he published during last year’s election did not come from Russia and promised additional helpful information about the leaks in the near future.

Rep. Dana Rohrabacher, a California Republican who is friendly to Russia and chairs an important House subcommittee on Eurasia policy, became the first American congressman to meet with Assange during a three-hour private gathering at the Ecuadorian Embassy in London, where the WikiLeaks founder has been holed up for years.

Rohrabacher recounted his conversation with Assange to The Hill.

“Our three-hour meeting covered a wide array of issues, including the WikiLeaks exposure of the [Democratic National Committee] emails during last year's presidential election,” Rohrabacher said,  “Julian emphatically stated that the Russians were not involved in the hacking or disclosure of those emails.

Pressed for more detail on the source of the documents, Rohrabacher said he had information to share privately with President Trump.  

“Julian also indicated that he is open to further discussions regarding specific information about the DNC email incident that is currently unknown to the public,” he added.

U.S. intelligence has insisted it has solid proof — which it has not made public — that Russia was behind last year’s election hacks that embarrassed Democrats, including unflattering revelations about nominee Hillary Clinton and her campaign chairman, John Podesta, whose personal email account was also hacked.

Assange has suggested in the past that Russia wasn’t the source of his leaked information. Tuesday marked the first time he has engaged with a U.S. lawmaker.