Here's why he did so - and what's likely to happen as a result.
Senate Democrats challenged his record on hot-button issues such as abortion, affirmative action and presidential power.
In his days before the committee, Kavanaugh has declined to answer questions about how he would handle investigations of the executive branch and whether he would step aside if cases involving Trump under Mueller's probe end up at the court. Chuck Grassley, R-Iowa, had established a process for review of that confidentiality.
Read the documents released by Sen.
Based on Sen. Patrick Leahy's questioning of Kavanaugh, it's clear that documents Chairman Chuck Grassley has unilaterally declared "Committee Confidential" include emails that are highly relevant--and may show the extent of Judge Kavanaugh's knowledge and use of stolen information while working at the White House, directly contradicting his testimony in 2004 and 2006. "How many times are you going to tell us this?" he asked.
Members of the Congressional Black Caucus are urging senators to reject the nomination of Brett Kavanaugh to serve on the Supreme Court.
He added: "The public has a right to access documents about a Supreme Court nominee's views on issues that are profoundly important, such as race and the law".
"If there's going to be some retribution against the senator from New Jersey, count me in", said Sen.
Klobuchar: Do you personally have any objections to the release of the documents from your time as staff secretary?
"I don't ever plan on running for president in 2020 or at any point in the future", North Carolina Republican Thom Tillis quipped minutes later when he also criticized Booker.
Booker called the process "a bit of a sham".
Trump attacks Sessions over prosecutions of Republicans
Mr Trump suggested Mr Sessions could lose his job in July a year ago when he said " time will tell" what happens to him. Trump's long-simmering anger stems from Sessions' decision to recuse himself from the Russian Federation investigation.
"Senator, I said that it's settled as a precedent of the Supreme Court, entitled the respect under principles 'stare decisis, ' " referring to the legal principle of not overturning precedents. "I come from a long line, as all of us do as Americans, of understanding what that kind of civil disobedience is, and I understand the consequences".
"I can't give you an answer on that hypothetical question", Mr Kavanaugh said. The act was against Senate rules and threatened to put Booker at risk of being ousted from his office.
The tone is different from Kavanaugh's remarks stressing how hard it is to overturn precedent like Roe during confirmation hearings, which opened for a third day Thursday with angry complaints and finger-pointing among senators over the unusual vetting process for the judge.
He was releasing it, Booker said, to show that what was being withheld had nothing to do with national security.
They continued as the Senate Judiciary Committee pressed Kavanaugh on abortion rights and assault weapons. "That is irresponsible and conduct unbecoming a Senator".
On Thursday morning, Cory Booker purposely broke the rules of the Senate.
Booker is talking here about Texas Sen. Dick Durbin, D-Ill., joined Booker, saying they would take similar actions and accept the same punishments.
"I've been told that the Senate minority leader or someone on the Democratic Party has invoked the two-hour rule". And let's just into this together.
The president's comment followed the statements of Democratic senators who warned that Trump was, in the words of Senator Richard Blumenthal of CT, "selecting a justice on the Supreme Court who potentially will cast a decisive vote in his own case".
Much of this is political melodrama, certainly.
Republican Orrin Hatch accused Democratic senators of political opportunism, noting, "We have folks who want to run for president", though he did not mention any by name.