"Americans rightly have many questions about this meeting, and today, we are releasing the transcripts and exhibits from interviews we've conducted to allow the public to know what we know", Senate Judiciary Committee Chairman Chuck Grassley, R-Iowa, said in a statement.
The committee did not interview Natalia Veselnitskaya, the Russian lawyer at the center of the meeting.
The June 2016 Trump Tower meeting has been central to those probes.
About 2500 pages of documents were released on Wednesday, including the interviews with Trump jnr and Rob Goldstone, a music publicist who arranged the meeting and said in text messages it was part of a Russian government effort to aid the Trump campaign. Kushner, President Donald Trump's son-in-law and senior adviser, told the Senate Judiciary Committee that he arrived to the meeting late and left early after he determined that "my time was not well spent at the meeting".
The documents cover more than 1,800 pages of transcripts of interviews with those connected to the controversial meeting that, when it was revealed, fueled allegations of Trump campaign coordination with Russian Federation. He also said there were no offers from the Russian side to release hacked emails, hack voting totals or anything else. He also doesn't go into detail about why he would love it "especially later in the summer". "Politics, I knew nothing about", Goldstone said, adding that neither did Emin Agalarov nor his father, Aras.
But the day after the blocked call - and two days before the Trump Tower meeting - the elder Mr Trump announces that he would be making a "major speech" the following week "discussing all of the things that have taken place with the Clintons".
But he did say "he may have commented through Hope Hicks", his former spokeswoman.
Last December, Trump jnr told House lawmakers that he couldn't answer questions about what he told his father after the meeting, citing attorney-client privilege, Adam Schiff, the top Democrat on the House Intelligence Committee, said afterward. According to emails, Trump Jr. was promised dirt about Trump's opponent, Democrat Hillary Clinton.
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That's in contrast to the House intelligence committee, which agreed with the majority of the report but said last month that the agencies "did not employ proper analytic tradecraft" while assessing Russian president Vladimir Putin's intentions.
The special counsel is investigating the Russian meddling in the election, whether Trump's campaign was involved and possible obstruction of justice.
Misleading the public or the media itself is not illegal, but attempts at deception could be evidence of a larger effort to hide potentially incriminating actions.
Comey, who was sacked by Trump previous year and recently released a book about leadership that described his encounters with the president and likened Trump to a mafia boss seeking loyalty, was also invited to testify but was not expected to appear, according to the committee aide. A super-secret society? Who or what are the "active sponsors of RNC" - and does RNC stand for the Republican National Committee?
His notes mention "Russian adoption by American families" and Bill Browder, a British citizen who has spearheaded a United States sanctions law - known as the Magnitsky Act - that targets Russian officials over human rights abuses.
Manafort's list is cryptic, and he declined an opportunity to speak to Senate investigators.
The transcripts show the dissatisfaction of Trump Jr. and other campaign aides, including brother-in-law Jared Kushner, when the meeting failed to yield the harmful Clinton information they thought they'd get - as well as the increasing panic of one of the meeting participants who feared his reputation would be ruined for his role in having set it up.
"He said, "it doesn't matter".