Kethledge, 51, is a University of Michigan Law School graduate and former Kennedy law clerk who works out of an office he set up in an old barn overlooking Lake Huron in northern Michigan.
Kavanaugh worked for president George W. Bush, who appointed him in 2003 to the US Court of Appeals in Washington - where he was finally confirmed by the Senate in 2006 after years of Democratic obstruction.
Hardiman, 53, a judge on the federal court in Philadelphia, is less known in terms of his legal philosophy, but has working-class roots that could make him attractive to the American public.
The president has been lobbied in the final hours of his selection process by both supporters and opponents of the four candidates, all of whom are federal appeals court judges with conservative records.
"Throughout legal circles, he is considered a judge's judge, a true thought leader among his peers", Trump said of Kavanaugh.
The drama-focused president is going to announce his choice for the Kennedy seat in a Monday night address to the country at 9 p.m.
Hirono's comments come in contrast to what other Senate Democrats have said of the nominee.
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.
But Kavanaugh, who grew up in Washington as the son of a schoolteacher, has the reputation of a staunch conservative, one who many Republicans no doubt hope could help overturn Roe v Wade, the landmark 1973 decision that guarantees women the right to an abortion.
One Democrat up for re-election, Bob Casey of Pennsylvania, announced Monday he would oppose any nominee from Trump's list of 25 possible candidates, drafted by conservative groups.
Democratic Sens. Heidi Heitkamp of North Dakota, Doug Jones of Alabama, Joe Manchin of West Virginia and Joe Donnelly of IN were invited for the announcement. Joe Manchin and North Dakota Sen.
Almost 18 months after Trump set in motion Justice Neil Gorsuch's nomination, the reality star-turned-president is more seasoned, more embittered and increasingly comfortable exerting his will over the machinery of government and his own staff. Pending confirmation by the U.S. Senate, Judge Kavanaugh would succeed Associate Justice Anthony Kennedy, 81, who is retiring after 30 years of service on the high court. Braun said Monday that the president has chosen another outstanding justice in Kavanaugh.
This story is breaking and will be updated.
They are calling on Senate Majority Leader Mitch McConnell, R-Ky., to wait until after the November election to schedule a hearing and vote.
Past announcements of Supreme Court nominees were not made in prime time.
Trump has enjoyed teasing details of his process in recent days, saying Thursday that he was down to four people and "of the four people, I have it down to three or two".
Democrats have little leverage as they try to halt the nomination - though the court's rightward lurch could stoke liberal turnout in the midterm elections in which the House of Representatives is in play.
Meanwhile, Sen. Chuck Schumer, D-New York, said that based off the president's list, it's "near impossible" to selected a nominee who isn't hostile to the Affordable Care Act and women's reproductive rights. Their support for Gorsuch and possibly Kavanaugh could attract moderate GOP voters in what are expected to be tight fall races - but also cost the centrist trio some backing from liberals and progressives opposed to Trump and his judicial nominees.
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