The US Senate has confirmed Judge Amy Coney Barrett to the Supreme Court in a victory for President Donald Trump a week before the general election, APA reports citing BBC.
Mr Trump's fellow Republicans voted 52-48 to approve the judge, overcoming the unified opposition of Democrats.
The 48-year-old took the oath of office at the White House alongside President Trump.
Her appointment seals for the foreseeable future a 6-3 conservative majority on the top US judicial body.
Only one Republican, Senator Susan Collins, who faces a tough re-election battle in Maine, voted against the president's nominee in Monday evening's vote.
The new justice is the third appointed by the Republican president, after Neil Gorsuch in 2017 and Brett Kavanaugh in 2018.