By Lawrence Hurley

WASHINGTON (Reuters) – Neil Gorsuch, picked by President Donald Trump and confirmed by the Republican-led Senate, was sworn in as a U.S. Supreme Court justice at the White House on Monday and was poised to have an instant impact on a court once again dominated by conservatives.

Trump earned the biggest political victory of his presidency and fulfilled a major campaign promise when the Senate voted on Friday to confirm the conservative federal appeals court judge from Colorado to the lifetime job despite vehement Democratic opposition. With Gorsuch aboard, the court once again has five conservative justices and four liberals.

Gorsuch took his judicial oath in a White House Rose Garden ceremony with Trump watching on, filling a vacancy that lingered for nearly 14 months after the death of conservative Justice Antonin Scalia in February 2016. The oath was administered by Justice Anthony Kennedy, for whom Gorsuch worked as a clerk as a young lawyer. Gorsuch will become the first justice to serve alongside a former boss.

All the other members of the court were at the ceremony, including liberal Justice Ruth Bader Ginsburg, who called Trump “a faker” last year during the presidential campaign but later said she regretted the remark. Trump at the time called on her to resign and said her “mind is shot.”

Scalia’s widow, Maureen, also attended the ceremony.

Gorsuch earlier in the day took his separate constitutional oath, administered by Chief Justice John Roberts, in a private ceremony at the Supreme Court with the other justices.

Trump made Gorsuch, 49, the youngest Supreme Court nominee since Republican President George H.W. Bush in 1991 selected Clarence Thomas, who was then 43. Gorsuch could be expected to serve for decades, and Trump could make further appointments to the high court to make it even more solidly conservative, with three of the eight justices 78 or older: Ginsburg, 84; fellow liberal Stephen Breyer, 78; and conservative swing vote Kennedy, 80.

Gorsuch will take part in the court’s next round of oral arguments, starting on April 17. They include a closely watched religious rights case on April 19 in which a Missouri church is objecting to being frozen out of state funds for a playground project due to a state ban on providing public money to religious organizations.

He is expected to take part in oral arguments in 13 cases during the court’s current term, which ends in June.

Gorsuch can be expected to have have an immediate impact of the court. He takes part on Thursday in the justices’ private conference to decide which cases to take up. Appeals are pending before the justices on expanding gun rights to include carrying concealed firearms in public, state voting restrictions that critics say are aimed at reducing minority turnout, and letting Christian business owners object on religious grounds to providing gay couples certain services.

Gorsuch could also play a vital role in some cases on which his new colleagues may have been split 4-4 along ideological lines and therefore did not yet decide. Those cases potentially could be reargued in the court’s next term, which starts in October.

Gorsuch’s wife, Louise, and his two daughters were also present at the private constitutional oath ceremony at the court, said Supreme Court spokeswoman Kathy Arberg. Louise Gorsuch held a family Bible as her husband took the oath, Arberg said.

The Senate, which last year refused to consider Democratic former President Barack Obama’s nomination of Merrick Garland, voted 54-45 to confirm Gorsuch.

(Reporting by Lawrence Hurley; Editing by Will Dunham)