By keeping Scalia's seat open, McConnell gave Trump a head start in putting his own stamp on the high court, and the president acknowledged as much when Gorsuch was sworn in past year.
Kavanaugh now serves as a judge on the U.S. Court of Appeals for the District of Columbia Circuit.
When Kavanaugh was approved in 2006 to the US appeals court, four Democratic senators voted in favor of him.
"First Justice Gorsuch, now Brett Kavanaugh - the President has kept his promise to nominate jurists who will faithfully protect the fundamental freedoms enshrined in our Constitution", the organization's Montana director, David Herbst, said.
During the announcement Monday evening, Trump called Kavanaugh a "judge's judge" and a "thought leader among his peers".
Mr Trump described his nominee as "one of the finest and sharpest legal minds of our time" and as a "judge's judge".
He later wrote in a Minnesota Law Review article, that sitting presidents should receive temporary deferral of civil suits and of criminal prosecutions and investigations, saying they are "time-consuming and distracting". If Kavanaugh proves to be strongly anti-Roe, it's possible the Supreme Court could overturn the decision, allowing states to outlaw abortion once again. "There's no way to sugarcoat it", said Dawn Laguens, Planned Parenthood executive vice president.
He also worked with special prosecutor Kenneth Starr during his investigation of President Bill Clinton back in the 1990s and spoke about the experience at the event.
Minutes after President Trump announced Brett Kavanaugh as his nominee for the U.S. Supreme Court, Alabama's Democratic senator took a wait-and-see approach. But Indiana's Joe Donnelly, North Dakota's Heidi Heitkamp and West Virginia's Joe Manchin all say they won't attend. Hardiman was counted as a front runner during last year's nomination that ultimately went to Gorsuch.
"We are confident he would strengthen the conservative wing of the Court and preserve the Constitution, as the framers intended". She needs to make it through a closed primary, in which only Republicans can vote, for her reelection bid in 2020, making opposing Trump unsafe.
If the Senate Judiciary Committee votes to approve the nomination, the candidate is then processed to the full Senate with the recommendation - confirm or deny.
With Democrats determined to vigorously oppose Trump's choice, the Senate confirmation battle is expected to dominate the months leading up to November's midterm elections.
The Republican caucus has a 51-49 advantage in the Senate, but one key member, Sen.
Trump planned to announce his pick Monday night.
On the Democratic side, the focus will be on Sens.
In that ruling, he said the majority was creating a "new right for unlawful immigrant minors in USA government detention to obtain immediate abortion on demand, barring any government efforts to expeditiously transfer the minors to their immigration sponsors before they make that momentous life decision".
Democrats are still stinging from Republicans refusing to even grant a hearing to President Barack Obama's choice to serve on the Supreme Court, Merrick Garland. A more conservative majority could be more willing to uphold state restrictions on abortion, if not overturn the 45-year-old landmark Roe v. Wade decision that established a woman's constitutional right.
Indicating that importance, Mr Trump called it "one of the most profound responsibilities of a president" to appoint a SC justice. Last week, Collins said "I would not support a nominee who would demonstrate hostility to Roe v. Wade".
Republicans may have a narrower margin for error than they did when the Senate confirmed Trump's first Supreme Court nominee, Neil Gorsuch, by a vote of 54-45 in April 2017.