On March 17, 2017, WikiLeaks tweeted that it had never communicated with Roger Stone, a longtime confidante and informal adviser to President Donald Trump. In his interview with the House Intelligence Committee last September, Stone, who testified under oath, told lawmakers that he had communicated with WikiLeaks via an “intermediary,” whom he identified only as a “journalist.” He declined to reveal that person’s identity to the committee, he told reporters later.

Private Twitter messages obtained by The Atlantic show that Stone and WikiLeaks, a radical-transparency group, communicated directly on October 13, 2016—and that WikiLeaks sought to keep its channel to Stone open after Trump won the election. The existence of the secret correspondence marks yet another strange twist in the White House’s rapidly swelling Russia scandal. Stone and Trump have been friends for decades, which raises key questions about what the president knew about Stone’s interactions with Wikileaks during the campaign. The White House did not immediately respond to a request for comment.

The depth of Stone’s relationship with WikiLeaks and Julian Assange has been closely scrutinized by congressional investigators examining whether Trump associates coordinated with Russia—or anyone serving as a cut-out for Moscow—to damage Hillary Clinton’s candidacy. Stone confirmed the authenticity of the messages, but called them “ridiculously out of context” and “a paste up.” He said that he provided the complete exchange to the House Intelligence Committee, but did not immediately respond to a request to provide his own record of the conversation to The Atlantic.

A screenshot of the exchange, which has not been previously reported, was provided to the House Intelligence Committee last year by a third-party source. The private messages confirm that Stone considered himself a “friend” of WikiLeaks, which was branded a “non-state hostile intelligence service” by CIA Director Mike Pompeo last April. Stone insisted that the messages vindicated his account. “They prove conclusively that I had no advance knowledge of content or source of WikiLeaks publications,” he said. “I merely had confirmed Assange’s public claim that he had information on Hillary Clinton and he would publish it.” He also narrowed the scope of his earlier denials, saying that he’d only denied having communicated directly with Assange, not with Wikileaks. Wikileaks did not immediately respond to a request for comment.

“I have never said or written that I had any direct communication with Julian Assange and have always clarified in numerous interviews and speeches that my communication with WikiLeaks was through the aforementioned journalist,” Stone told the committee in his prepared statement in September. The full hearing was held behind closed doors and the transcript has not been made public. At least one lawmaker had already obtained a screenshot of the exchange before Stone testified, according to two sources familiar with the matter who requested anonymity to discuss the ongoing investigation.

The correspondence raises questions about whether Stone—who served as Trump’s lobbyist in Washington in the late 1990s and early 2000s, and had been encouraging him to run for president for over a decade—has kept secret any interactions that may be of interest to congressional investigators examining Russia’s election interference.