This post has been updated with the Wall Street Journal’s new reporting on Roger Stone telling Sam Nunberg he had “dined” with Assange.

Longtime Trump adviser Roger Stone is in an increasing amount of trouble in the Russia investigation, it would seem.

What is less clear is how much his trouble might ensnare President Trump.

The Washington Post reported recently on previously unknown alleged contacts between Stone and WikiLeaks founder Julian Assange. A person close to the situation, who spoke on the condition of anonymity, told The Post that Stone spoke in spring 2016 about communications in which Assange talked about having hacked Democratic emails. The Post also reported that none other than Stone protege Sam Nunberg confirmed that Stone told him he had met with Assange — something Stone contends was a joke Nunberg misunderstood.

Now the Wall Street Journal has the email in which Stone claimed to Nunberg that he had met with Assange. “I dined with Julian Assange last night,” Stone wrote to Nunberg on Aug. 4, 2016.

Roger Stone explains his communication with Russian hacker Guccifer 2.0 and Wikileaks founder Julian Assange. (McKenna Ewen, Jorge Ribas/The Washington Post)

Stone still says it was a joke and that he can prove he did not meet with Assange. The timeline is pretty damning, and the alleged contacts seriously undermine Stone’s denials of working with WikiLeaks. The email to Nunberg came three weeks before Stone tweeted that Podesta would soon experience his “time in the barrel.” (Weeks later, Podesta’s emails were released by WikiLeaks.) The Post’s recent report was the first clear suggestion he had advance knowledge of the Podesta emails.

Stone has argued the tweet referred to legal troubles ahead for Podesta stemming from the release of the Panama Papers. He has also admitted he had been in contact with Guccifer 2.0 — the allegedly Russian-affiliated hacker behind the DNC emails — and that he communicated with Assange through an intermediary (allegedly a journalist) whom he has declined to name.

The new email further calls into question Stone’s repeated denials of contact with Assange. Stone said in a previously uncovered Aug. 8, 2016, speech — four days after the email — he had been in contact with Assange. But 10 days later, he denied it. “I have not spoken to Mr. Assange,” he said. “I have not met with Mr. Assange. And I never said I had.”

We now have at least two concrete examples, though, of Stone saying he had been in contact with Assange — both around the same time, and both shortly before the seemingly prescient Podesta tweet. For someone who says he did not meet with Assange, Stone sure spent a conspicuous amount of time saying he had met with Assange.

So let’s say for argument’s sake that Stone was working with Assange. If that is the case, how much might it implicate the Trump campaign or Trump himself? That is not clear, given that Stone was an informal outside adviser rather than a campaign aide. It is also unclear whether working with WikiLeaks would amount to collusion, given that its alliance with the Russians is somewhat murky (the intelligence community essentially regards it as a front for the Kremlin).

As recently as last week, Stone argued working with WikiLeaks would not be treasonous because it is not, in fact, aligned with Russia.

“No, actually, I don’t think so because for it to be a treasonous act, Assange would have to be probably a Russian asset and WikiLeaks would have to be a Russian front, and I do not believe that is the case,” Stone told Chuck Todd.

During that appearance, Stone offered several apparently carefully worded denials, including saying he did not know about “the content, the source or the exact timing of the WikiLeaks disclosures” — comments that notably still allowed for him to have known about the existence of the emails. He also said clearly, though, he had never spoken with Trump about WikiLeaks disclosures at any point, which if true would seem to insulate the president.

Trump’s knowledge aside, former federal prosecutor Patrick Cotter said the development could be a “very important piece” of the puzzle — albeit only a piece.

“It is unlikely that any one contact between someone that could be credibly connected to the Trump campaign and someone working for or with the Russians would, alone, establish the coordination,” Cotter said, adding: “The more pieces of credible evidence that the special prosecutor can find of connections between people on Trump’s team and the Russians — even if the connections go through intermediaries like Stone and Assange — the stronger the overall case.

Another former federal prosecutor, Jeffrey Cramer, said for such contacts to be criminal, you would have to surmise Stone’s intentions. But, he said, it “does provide a link for investigators.”

“Did he knowingly enter into an agreement with WikiLeaks and Russia to help the Trump campaign?” Cramer said. “If he did, then he might be culpable, as would anyone else who helped facilitate the relationship and/or promise anything in return.

“If Assange clued in Stone as to the source of the hacks, then investigators are on their way to building a case.”