In the days leading up to Trump's announcement, some conservatives were concerned Mr Kavanaugh would not be far enough to the right on certain issues including abortion and health care.
"That President happened to be Ronald Reagan", Trump said, pausing to recognize Reagan's Attorney General, Edwin Meese, who has been an architect of a decades-long effort to seed the federal judiciary with conservative thinkers. The judge indicated that on the high court he would faithfully interpret the Constitution as it is written, providing an unsurprising nod to originalism.
His tightly orchestrated wind-up announcing Brett Kavanaugh as his latest pick for the Supreme Court, bore all the hallmarks of a matchmaking show, but, unlike some of his other staged events, the hype, the pageantry and the photo op Trump relishes is backed up by serious outcome.
Before he was nominated to the DC circuit by George W. Bush, he was the former president's staff secretary and worked for Bush during the 2000 Florida vote recount.
In the 1990s Judge Kavanaugh helped his mentor, independent counsel Kenneth Starr, to investigate President Bill Clinton. He graduated with a Bachelor of Arts in 1987, and received his Juris Doctor from Yale Law School in 1990.
He added: "Throughout legal circles he's considered a judge's judge, a true thought leader among his peers". The ad is expected to feature an introductory bio on the president's yet-to-be-named Supreme Court nominee.
"An exceptional person will be chosen!" he tweeted Sunday. The court's ruling in her favor was based on a constitutional principle, he wrote, "as novel as it is wrong: a new right for unlawful immigrant minors in U.S. Government detention to obtain immediate abortion on demand".
"He's a brilliant jurist with a clear and effective writing style, universally regarded as one of the finest and sharpest legal minds of our time".
A favourite of the Republican legal establishment in Washington, Kavanaugh, 53, is a former law clerk for retiring Justice Anthony Kennedy.
In addition to abortion, the court could shift to the right on the death penalty, racial discrimination, environmental law and gay rights, all areas where Kennedy at least sometimes joined the court's liberal wing.
Chief Justice John Roberts may now become the swing vote.
"FreedomWorks calls upon Majority Leader McConnell to act swiftly and ensure Kavanaugh is confirmed on the Senate floor".
Kennedy's position in the court's centre guarantees a fierce confirmation fight.
Trump will announce his decision Monday at 9 p.m.
A handful of Senate Democrats running for re-election in states that Trump won handily in 2016 could face a hard vote on the court nominee, potentially providing Republicans with an additional buffer if they decide to support the president.
In confirming Trump's first Supreme Court nominee Neil Gorsuch, Republicans eliminated the 60-vote requirement to advance a nomination to the High Court.
The White House plans a robust promotional campaign on Kavanaugh's behalf.
Trump is hoping to replicate his successful nomination of Justice Gorsuch past year.
"I especially want to express our gratitude to Mitch McConnell for all that he did to make this achievement possible", Trump said.