Trump, he added, is expected to announce his pick on Monday or sooner.
Trump's process has echoes of his search for a Supreme Court justice previous year - he eventually nominated Neil M. Gorsuch - and his consideration of a running mate during the 2016 presidential campaign.
Trump's nominee will replace Justice Anthony Kennedy, who announced his intention to retire last week after three decades on the high court.
"I guarantee you this, if the president puts forward a federalist society, and that person is confirmed, we know Roe v Wade and a woman's right to choose is on the chopping block", Sen Jeff Merkley said. Honestly I could pick any of the 25 and they would be terrific.
Orrin Hatch (R-Utah) may have given a big clue as to the identity of Trump's nominee.More news: Eleven killed, at least 45 missing as torrential rain pounds Japan
The president's top contenders include federal appeals court judges Amy Coney Barrett, Brett Kavanaugh and Raymond Kethledge, with federal appeals court judge Thomas Hardiman still considered in the mix.
On abortion, Barrett has said that she believes life begins at conception, and has also criticized Roe v. Wade. But the tactical approach in question - appealing directly to the American public - speaks to the extent to which the court of popular opinion has become a formidable force in USA politics in the aftermath of Trump's election.
And Kavanaugh also worked on "The Starr Report", which outlined the grounds for President Bill Clinton's impeachment. Ted Cruz of Texas and Sen.
Trump nominated Barrett for to the federal bench in May a year ago. The appointment of either judge would broaden that gap to 10 years. And I will devote all my energies to ensuring that we confirm the kind of Supreme Court justice America needs: "a justice who says what the law is, not what she wants it to be; a justice who calls balls and strikes instead of swinging for the fences; a justice whose foremost allegiance is to the American people and to the Constitution".
Collins made that clear when she met with Trump shortly after Kennedy's retirement at the end of June.More news: Pompeo in Pyongyang to Seek Concrete Nuclear Commitments
A Trump federal appeals court pick in 2017, Barrett was grilled by Democrats about her religious background at her confirmation hearing - with Sen.
Kethledge serves on the Cincinnati-based 6th U.S. Circuit Court of Appeals.
He also co-authored a book on leadership and solitude, Lead Yourself First. For Democrats to take back the Senate in November, McCaskill's party would need to hold all of their 26 seats up for election and win two of the nine Republican seats in play. He likes to work in a converted barn office overlooking Lake Huron, with a wood stove and no Internet, when he writes opinions.
Like Kethledge, Kavanaugh is a textualist and originalist.
"He looks, walks and quacks like John G. Roberts Jr.", said former Virginia attorney general Ken Cuccinelli II, referencing the chief justice of the United States, who angered conservatives with his rulings on President Barack Obama's signature health-care law. Trump past year appointed conservative Justice Neil Gorsuch to take a seat that the Republican-led U.S. Senate, which must confirm nominees to the high court, had prevented Democratic former President Barack Obama from filling in 2016 following the death of conservative Justice Antonin Scalia.More news: England target World Cup semis after Belgium stun Brazil