In pictures: Labour Party leader Keir Starmer

Starmer, as director of public prosecutions, makes a statement to the media in London in 2010. He was later knighted for the job he did running the Crown Prosecution Service of England and Wales.

Starmer arrives at London's High Court in 2012 to give evidence at the Leveson Inquiry, which looked into the culture, practices and ethics of the media.

Starmer, right, campaigns for Parliament in April 2015. He was the Labour Party candidate in the London constituency of Holborn and St Pancras. He was elected the next month.

Starmer appears on "The Andrew Marr Show" with then-Foreign Secretary Boris Johnson in 2016. Labour leader Jeremy Corbyn made Starmer the party's shadow Brexit spokesperson following the 2016 referendum. In the UK, the main opposition party has "shadow" ministers who hold political portfolios.

Starmer delivers a speech at Chatham House in London in March 2017, just before Prime Minister Theresa May sent a letter to European Union leaders to announce the start of departure negotiations. "While Labour did not support leaving the European Union and I campaigned passionately against it, we have accepted that that choice was made and that it will now be delivered," Starmer said while laying out the party's vision for the future.

Starmer campaigns with Labour's Nia Griffith in Pembrey, Wales, in May 2017. Both were re-elected to Parliament.

Starmer addresses the Labour Party Conference in Brighton, England, in September 2017.

Starmer tours the technology training facility at Birmingham City University in Birmingham, England, in March 2018.

Starmer signs a poster for a delegate during the Labour Party Conference in Liverpool, England, in September 2018.

Starmer, left, and then-Labour Party leader Jeremy Corbyn leave together after a meeting with the European Union's chief Brexit negotiator in Brussels, Belgium, in March 2019.

Starmer addresses an audience in Harlow, England, in November 2019.

From right, Labour leadership candidates Starmer, Lisa Nandy, Emily Thornberry, Jess Phillips and Rebecca Long-Bailey debate one another in Liverpool in January 2020.

Starmer meets nurses during a visit to Addenbrooke's Hospital in Cambridge, England, in February 2020.

Starmer attends a rally in London in February 2020. He would go on to be elected Labour leader, succeeding Corbyn.

Starmer, front left, attends a hybrid Parliament session in London in April 2020.

Starmer and his wife, Victoria, applaud essential workers outside their home in London in May 2020. This was during the first few months of the Covid-19 pandemic.

Starmer speaks with nurses and midwives during a visit to the Whittington Hospital in London in March 2021.

Starmer visits the Vulcan Boxing Club in Hull, England, during a campaign stop in April 2021.

Starmer and London Mayor Sadiq Khan, right, visit the Evelyn Community Centre in London in May 2021.

Starmer delivers the keynote speech during the Labour Party Conference in Brighton, England, in September 2021. It was his first in-person conference as Labour leader.

Starmer, left, speaks with former British prime ministers Tony Blair, center, and Gordon Brown during the Accession Council ceremony in London where King Charles III was formally proclaimed monarch in September 2022.

Starmer walks behind British Prime Minister Liz Truss during the ceremonial procession of the coffin of Queen Elizabeth II in September 2022.

Starmer celebrates an England goal as he watches a World Cup match from London in November 2022.

Starmer speaks at the House of Commons in December 2022.

While visiting Scunthorpe, England, in April 2023, Starmer meets representatives from organizations that are dedicated to supporting victims of violence against women and girls.

Starmer speaks to supporters in Chatham, England, in May 2023.

A protester throws glitter over Starmer, disrupting his keynote speech at the Labour Party Conference in Liverpool in October 2023.

Starmer travels with Rachel Reeves, shadow chancellor of the Exchequer, for a shadow cabinet meeting in April 2024.

Starmer holds a card featuring six election pledges during a Labour event in Purfleet, England, in May 2024.

Starmer campaigns in Gillingham, England, in May 2024.

Starmer and his wife, Victoria, arrive at a polling station to vote in the general election in July 2024.

Starmer speaks after winning the constituency of Holborn and St Pancras during the general election in July 2024.

Starmer talks with King Charles III at Buckingham Palace after the election. The King invited Starmer to become prime minister and form a new government.

Starmer and his wife, Victoria, greet Labour campaigners and activists at No. 10 Downing Street after the election.

Starmer delivers his first speech as prime minister outside No. 10 Downing Street. "You have given us a clear mandate, and we will use it to deliver change, to restore service and respect to politics, end the era of noisy performance, tread more lightly on your lives, and unite our country," Starmer said.

The Starmers wave from the steps of No. 10 Downing Street.