"I plan to review Judge Kavanaugh's record thoroughly and ask him tough questions face-to-face before I make my decision", Brown said.
"Brett Kavanaugh has been one of the most learned judges in America on a variety of issues, ranging from theories of statutory interpretation to separation of powers", added William N. Eskridge, Jr.
President Donald Trump has chosen a solidly conservative, pro-life judge for the Supreme Court as he shifts the highest court ever further to the right. The President dwelled on Kavanaugh's Ivy League credentials, which were a focus of Trump's during the selection process, and the fact that, like Gorsuch, Kavanaugh had also clerked for Justice Kennedy.
Democrats are certain to press Mr Trump's latest nominee on the landmark 1973 Roe v Wade ruling that legalised abortion nationwide. But his supporters have cited his experience and wide range of legal opinions.
Some Republican senators had favored other options. "I look forward to meeting with Judge Kavanaugh during the confirmation process".
Democrats and liberal advocacy groups quickly lined up in opposition.
Many Democrats fear that Kavanaugh's conservative credentials - in a bench that is now tied 4-4 between liberal and conservative justices- will tilt the court right for the foreseeable future, allowing a rewriting of everything from hard won rights on abortion to same-sex marriage.
The White House invited a number of senators to attend the Monday night announcement.
The Senate will now vote on Kavanaugh's nomination.
And so did the Senate's other two most endangered Democrats, Sens.
White House spokesman Raj Shah says the Arizona Republican "has agreed to serve as the Sherpa for the President's nominee to the Supreme Court".
Justice Kennedy sometimes sided with the court's liberal justices on divisive social issues.
At the top of that list is abortion.
Ms Collins has said she will not vote for any candidate who threatens abortion rights.
Kennedy's replacement also could be more willing to allow states to carry out executions and could support undoing earlier court holdings in the areas of racial discrimination in housing and the workplace.
Senate Democratic Leader Chuck Schumer and all 10 Democrats on the Judiciary panel gathered on the steps of the Supreme Court Tuesday to oppose Kavanaugh.
He is now a United States Circuit Judge of the United States Court of Appeals for the D.C. Circuit. In 2003, he served as Assistant to the President as the White House Staff Secretary, according to SCOTUS Blog.
If confirmed, Kavanaugh would receive a raise of nearly 16% from his current, $220,600-per-year salary for his role as a circuit judge.
If he were to be confirmed, some critics worry that judicial philosophy could enable Trump to avoid having to testify in special counsel Robert Mueller's probe into Russian interference in the 2016 presidential election. But in a 2017 case involving a teen in immigration custody who was seeking an abortion, he wrote the dissenting opinion that would have given the government more say.
Despite this, Judge Kavanaugh appears to take a restrictive view of the federal government's regulatory authority, arguing in a dissent this year that the Consumer Financial Protection Bureau is unconstitutional, and opposing the FCC's net neutrality rule aimed at ensuring a free and open internet.