Keir Starmer officially became the new prime minister of the United Kingdom after the Labor Party’s big win Thursday in the general election, The Associated Press reported.

Conservative Rishi Sunak resigned as prime minister, and Starmer met Friday with King Charles III, who approved him to form a new government.

The Labour Party won a majority of votes to thrust Starmer, leader of the Labour Party, into the powerful position. Sunak had been prime minister since October 2022.

Starmer, who became the first Labour prime minister in 14 years, said he intends to put “country first, party second.”

UK ELECTION EXIT POLLING SUGGESTS LABOUR IS HEADED FOR LANDSLIDE VICTORY

Labour Party leader Keir Starmer speaks to his supporters at the Tate Modern in London, Friday, July 5, 2024. (AP Photo/Kin Cheung)

“We have to return politics to public service,” Starmer said, adding that a position of his new stature “comes with great responsibility.”

The Labour Party’s win on Thursday is one of the biggest-ever for the House of Commons.

Sunak said he “takes responsibility for the loss” and that a “sobering verdict” was delivered by the British people during a concession speech.

Outgoing British Prime Minister Rishi Sunak leaves the Conservative Campaign Headquarters in London, Friday, July 5, 2024.  (AP Photo/Thomas Krych)

“I take responsibility for the loss,” Sunak said. “To the many good, hard-working Conservative candidates who lost tonight, despite their tireless efforts, their local records and delivery, and their dedication to their communities. I am sorry.”

Sunak said called Starmer to congratulate him on his victory.

“Today, power will change hands in a peaceful and orderly manner, with goodwill on all sides. That is something that should give us all confidence in our country’s stability and future,” Sunak said.

BRITONS CAST THEIR VOTES IN HEAVILY-ANTICIPATED UK PARLIAMENTARY ELECTION

Sunak conceded the election about 30 minutes before the Labour Party secured the 326 required seats — out of the possible 650 — to win the election and form the new government.

Labour leader Sir Keir Starmer and his wife Victoria at the Tate Modern, central London, for a watch party, Friday July 5, 2024, for the results of the 2024 General Election in central London. (Jeff Moore/PA Images via Getty Images)

Australian Prime Minister Anthony Albanese tweeted he looked forward “to working constructively” with the new government, and New Zealand Prime Minister Christopher Luxon wrote, “New Zealand and the UK are great friends and can do so much more together.” Luxon also thanked Sunak “for your service to your nation and friendship to New Zealand.”

UK’S CONSERVATIVES ON TRACK TO LOSE NEXT ELECTION, CRITICS BLAST POOR MIGRATION POLICY: ‘PEOPLE HAVE GIVEN UP’

Former British Prime Minister Liz Truss, whose premiership lasted a mere 49 days, also lost her lawmaker’s seat in the election.

Truss lost her Norfolk South West seat by a few hundred votes.

Many other high-profile Conservative lawmakers also lost their seats, including House of Commons leader Penny Mordaunt.

CLICK HERE TO GET THE FOX NEWS APP

The latest vote tally shows the Labour Party won 410 seats in the 650-seat House of Commons as compared to the 118 seats for the Conservatives.

Since Margaret Thatcher became the Conservative Party leader in 1979, Conservatives have controlled the government all but 13 years until now.

The Associated Press contributed to this report.