WASHINGTON (AP) — President Donald Trump nominated Judge Amy Coney Barrett to the Supreme Court on Saturday, capping a dramatic reshaping of the federal judiciary that will resonate for a generation and that he hopes will provide a needed boost to his re-election effort.

Republican senators are already lining up for a swift confirmation of Barrett ahead of the November 3 election, as they aim to lock in conservative gains in the federal judiciary before a potential transition of power. Trump, meanwhile, is hoping the nomination will serve to galvanise his supporters as he looks to fend off Democrat Joe Biden.

Trump hailed Barrett as “a woman of remarkable intellect and character,” saying he had studied her record closely before making the pick.

“I looked and I studied, and you are very eminently qualified,” he said as Barrett stood next to him in the Rose Garden.

An ideological heir to the late conservative Justice Antonin Scalia, Barrett would fill the seat vacated after the September 18 death of liberal icon Ruth Bader Ginsberg, in what would be the sharpest ideological swing since Clarence Thomas replaced Justice Thurgood Marshall nearly three decades ago. She would be the sixth justice on the nine-member court to be appointed by a Republican president, and the third of Trump’s first term in office.

For Trump, whose 2016 victory hinged in large part on reluctant support from conservative and white evangelicals on the promise of filling Scalia’s seat with a conservative, the latest nomination in some ways brings his first term full circle. Even before Ginsburg’s death, Trump was running on having confirmed in excess of 200 federal judges, fulfilling a generational aim of conservative legal activists.

“This is my third such nomination after Justice Gorsuch and Justice Kavanaugh, and it is a very proud moment indeed,” Trump said in the Rose Garden.

Trump joked that the confirmation process ahead “should be easy” and “extremely non-controversial,” though it is likely to be anything. No court nominee has been considered so close to a presidential election before, with early voting already underway. He encouraged Democrats to take up her nomination swiftly and to “refrain from personal and partisan attacks”.

The set design, with large American flags hung between the Rose Garden colonnades, appeared to be modeled on the way the White House was decorated when President Bill Clinton named Ginsburg as his nominee in 1993.

Senate Majority Leader Mitch McConnell says the Senate will vote “in the weeks ahead” on Barrett’s confirmation, saying that Trump “could not have made a better decision” in nominating the appellate court judge.

The announcement came before Ginsburg is buried beside her husband next week at Arlington National Cemetery. On Friday, she was the first woman to lie in state at the Capitol, and mourners flocked to the Supreme Court for two days before that to pay respects.

Barrett said she was “truly humbled” by the nomination, adding that she would be “mindful of who came before me.” She praised Ginsburg upon accepting the nomination, saying, “She has won the admiration of women across the country and indeed all across the world.”

Within hours of Ginsburg’s death, Trump made clear he would nominate a woman for the seat, and later volunteered he was considering five candidates. But Barrett was the early favourite, and the only one to meet with Trump.

Barrett has been a judge since 2017, when Trump nominated her to the Chicago-based 7th US Circuit Court of Appeals. But as a long-time University of Notre Dame law professor, she had already established herself as a reliable conservative in the mold of Scalia, for whom she clerked in the late 1990s.

She would be the only justice on the current court not to have received her law degree from an Ivy League school. The eight current justices all attended either Harvard or Yale.

The staunch conservative had become known to Trump in large part after her bitter 2017 appeals court confirmation included allegations that Democrats were attacking her Catholic faith. The president also interviewed her in 2018 for the vacancy created by the retirement of Justice Anthony Kennedy, but Trump ultimately chose Brett Kavanaugh.

Trump and his political allies are itching for another fight over Barrett’s faith, seeing it as a political windfall that would backfire on Democrats. Catholic voters in Pennsylvania, in particular, are viewed as a pivotal demographic in the swing state that Biden, also Catholic, is trying to recapture.

While Democrats appear powerless to stop Barrett’s confirmation in the GOP-controlled Senate, they are seeking to use the process to weaken Trump’s re-election chances.

Barrett’s nomination could become a reckoning over abortion, an issue that has divided many Americans so bitterly for almost half a century. The idea of overturning or gutting Roe v. Wade, the landmark 1973 decision that legalised abortion, has animated activists in both parties for decades. Now, with the seemingly decisive shift in the court’s ideological makeup, Democrats hope their voters will turn out in droves because of their frustration with the Barrett pick.

Trump has also increasingly embraced the high court — which he will have had an outsized hand in reshaping — as an insurance policy in a close election.

Increases in mail, absentee and early voting brought about by the coronavirus pandemic have already led to a flurry of election litigation, and both Trump and Biden have assembled armies of lawyers to continue the fight once vote-counting begins. Trump has been open about tying his push to name a third justice to the court to a potentially drawn-out court fight to determine who will be sworn in on January 20, 2021.

“I think this will end up in the Supreme Court,” Trump said Wednesday of the election, adding, “And I think it’s very important that we have nine justices.”

Meanwhile, outside conservative groups are planning to spend more than $25 million to support Trump and his nominee. The Judicial Crisis Network has organised a coalition that includes American First Policies, the Susan B. Anthony List, the Club for Growth and the group Catholic Vote to help confirm Barrett, and Trump’s campaign is expected to include the nomination in upcoming advertising.

“In nominating Amy Barrett to the Supreme Court, President Trump has again fulfilled his promise to appoint Justices who are not only exceptionally qualified, but willing to bravely stand up for the constitution as it’s written and not bend to political pressures or personal preferences,” said the conservative Federalist Society’s Leonard Leo, who has advised Trump on judicial appointments.