FILE - Britain's opposition Labour party leader Jeremy Corbyn, left, sits waiting to speak next to Keir Starmer Labour's Shadow Secretary of State for Exiting the European Union during their election campaign event on Brexit in Harlow, England, Tuesday, Nov. 5, 2019. Britain goes to the polls on Dec. 12. (AP Photo/Matt Dunham, File)

FILE - British Labour Party opposition leader Keir Starmer, left, and Britain's Prime Minister Boris Johnson pass a statue of former Prime Minister Margaret Thatcher as they walk through the Members' Lobby following the State Opening speech of Parliament at the Palace of Westminster in London, Tuesday, May 10, 2022. Toby Melville/Pool Photo via AP, File)

FILE - Labour leader Keir Starmer, right, meets with Ukrainian President Volodymyr Zelenskyy at Speaker's House in the Palace of Westminster, London, during his first visit to the UK since the Russian invasion of Ukraine, Wednesday Feb. 8, 2023. (Stefan Rousseau/pool photo via AP, FIle)

FILE - From left, Labour leader Sir Keir Starmer, former Prime Ministers Tony Blair and Gordon Brown ahead of the Accession Council ceremony at St James's Palace, London, London, Saturday, Sept. 10, 2022, where King Charles III is formally proclaimed monarch. (Kirsty O'Connor/Pool Photo via AP, File)

FILE - Keir Starmer, leader of Britain's opposition Labour Party, speaks to the media during a visit to the COVID-19 Memorial Wall opposite the Houses of Parliament on the Embankment in London, Monday March 29, 2021. (AP Photo/Kirsty Wigglesworth, File)

FILE - Labour Party leader Keir Starmer, left, and Prime Minister Boris Johnson lay wreaths during the Remembrance Sunday service at the Cenotaph, in Whitehall, London, Sunday Nov. 14, 2021. (Aaron Chown/Pool via AP, File)

FILE - Britain's Prime Minister Rishi Sunak, center, stands with Labour Party leader Keir Starmer, left, former Prime Ministers Liz Truss, fourth right, Boris Johnson, second right, and Theresa May, right, to attend the Remembrance Sunday ceremony at the Cenotaph on Whitehall in London, Sunday, Nov. 12, 2023. (AP Photo/Kin Cheung, Pool, File)

FILE - King Charles III greets Labour leader Sir Keir Starmer, during an audience in the 1844 Room, at Buckingham Palace, London, Saturday, Sept. 10, 2022. (Jonathan Brady/Pool Photo via AP, File)