0958 GMT November 22, 2017
According to CNN, Trump Jr. tweeted the exchange shortly after The Atlantic first reported on the correspondence, writing: "Here is the entire chain of messages with @wikileaks (with my whopping 3 responses) which one of the congressional committees has chosen to selectively leak. How ironic!"
According to the released messages, WikiLeaks reached out to President Donald Trump's adult son just before midnight on September 20, 2016, regarding a PAC-funded, anti-Trump website.
The New York Times reported in July 2016 that US intelligence agencies believed that Russia was behind the Democratic National Committee hacking.
On October 7, 2016, the intelligence community publicly announced that US intelligence officials have assessed "with high confidence" that Russian intelligence hacked the DNC and Clinton campaign chairman John Podesta, and then subsequently provided internal materials obtained through the hacks to WikiLeaks so they could be publicly released.
A source familiar with the matter told CNN that Congress has had the documents for a while, and Trump Jr. was briefly asked about the exchanges during a closed-door interview he had with the Senate judiciary committee in September 2017.
Although the messages are predominantly one-sided, according to The Atlantic, they were turned over to congressional investigators by Trump Jr.'s lawyers.
Alan Futerfas, an attorney for Trump Jr., said in a statement provided to the Atlantic, "Putting aside the question as to why or by whom such documents, provided to Congress under promises of confidentiality, have been selectively leaked, we can say with confidence that we have no concerns about these documents and any questions raised about them have been easily answered in the appropriate forum."
Trump Jr. responded to two of the messages initiated by WikiLeaks, the one sent on September 21, 2016, and then again on October 3, 2016.
In the October 3 exchange, the WikiLeaks Twitter account sent a message to Trump Jr. that said: "Hiya, it'd be great if you guys could comment on/push this story," and proceeded to link to a quote from Hillary Clinton suggesting a drone strike against WikiLeaks founder Julian Assange, according to the messages shared by Trump Jr.
"Already did that earlier today," Trump Jr. wrote back. "It's amazing what she can get away with."
Trump Jr. then proceeded to inquire about a "Wednesday leak."
"What's behind this Wednesday leak I keep reading about?" he wrote, according to The Atlantic.
This communication came days before the official intelligence community assessment that it thought Russia was behind the DNC hacks and that it was disseminating information through WikiLeaks and Guccifer 2.0.
Also on October 7, 2016, WikiLeaks began releasing Podesta's emails.
The news comes amid several investigations into possible links between the Trump campaign and Russia. Trump Jr. faced scrutiny after it was revealed he agreed to meet with a Russian attorney who was promising "dirt" on Clinton. That meeting, in June 2016 at Trump Tower, included Trump Jr., Jared Kushner and Paul Manafort.