On Tuesday morning, Trump Jr. appeared to confirm the Times report when he posted a series of emails to Twitter.

One email sent by Rob Goldstone, a publicist who reportedly helped set up a meeting between Trump Jr. and the Russian lawyer, reads: “The Crown prosecutor of Russia met with his father Aras this morning and in their meeting offered to provide the Trump campaign with some official documents and information that would incriminate Hillary and her dealings with Russia would be very useful to your father. This is obviously very high level and sensitive information but is part of Russia and its government’s support for Mr. Trump.” Another email in the chain of correspondence sent by Trump Jr. reads: “if it’s what you say I love it.”

The email disclosures are the latest in a series of explosive revelations detailing ties between Trump allies and Russian operatives. The news will inevitably worsen the cloud of scandal and controversy surrounding the White House. It remains to be seen, however, exactly how it will impact the ongoing federal and congressional investigations into Russian involvement in the election.

During a press conference on Tuesday, Schumer called on Trump Jr. “and other campaign associates to turn over any and all documents, and electronic communications that investigators ask for.” He added, “we need public testimony under oath of Donald Trump Jr. who has changed his story repeatedly.”

Representative Adam Schiff, the top Democrat on the House Intelligence Committee, described the revelations as “very significant” and “deeply disturbing,” calling them “new, public information about direct contacts between the Russian government and its intermediaries, and the very center of the Trump family, campaign, and organization.” He added: “we need to get to the bottom of exactly what happened, what was said in that meeting, what went into organizing that meeting, as well as if that meeting was just the beginning, or a testing of the wasters to see whether the campaign would be receptive to their engagement and involvement in the presidential election.”

“Nothing is proven yet. But we’re now beyond obstruction of justice in terms of what’s being investigated. This is moving into perjury, false statements, and even into potentially to treason,” Democratic Senator Tim Kaine, Hillary Clinton’s former vice presidential running mate, told reporters Tuesday morning.

Kaine wasn’t the only Democrat in Congress to raise the possibility of treason on Tuesday. Democratic congressman Seth Moulton wrote on Twitter in response to the email transcript, “If this isn't treasonous, I'm not sure what is.”

Speaking to reporters on Tuesday, Republican Senator Lindsey Graham also expressed concern, saying: “Anytime you’re in a campaign, and you get an offer from a foreign government to help your campaign, the answer is no. I don’t know what Mr. Trump Jr.’s version of the facts are, definitely he has to testify, that email was disturbing … on its face this is very problematic.”