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In photos: U.K. votes in election dominated by Brexit

Britain's Prime Minister Boris Johnson poses with his dog Dilyn as he leaves from a Polling Station
Britain's Prime Minister Boris Johnson leaves from a polling station with his dog Dilyn after casting his ballot in London Thursday. Photo: Daniel Leal-Olivas/AFP via Getty Images

Polls across the United Kingdom opened Thursday morning as millions of Brits vote in the country's third general election since 2015.

Why it matters: Prime Minister Boris Johnson has staked his leadership on a promise to "get Brexit done" by securing a majority in the election, after facing a parliamentary impasse on the issue in a minority government. But if he loses, he'll go down as one of the shortest-serving prime ministers in history.

Students from the University of Reading arrive to vote in the General Election 2019 on graduation day
Students from the University of Reading arrive to vote in the General Election 2019 on graduation day. Photo: Steve Parsons/PA Images via Getty Images
A man walks with a dog as he arrives to vote at a polling station in Furnace, near Inveraray
A man arrives to vote at a polling station in Furnace, near Inveraray, Scotland. Photo: Paul Ellis/AFP via Getty Images
Britain's main opposition Labour Party leader Jeremy Corbyn poses as he arrive at a Polling Station to cast his ballot paper and vote, in north London
Labour Party leader Jeremy Corbyn arrives to vote in north London. Photo: Daniel Leal-Olivas/AFP via Getty Images
A man in a santa hat and a man in an Elmo costume outside the polling station at Pakeman Primary School in Islington, north London
A man in a Santa Claus hat and a man in an Elmo costume outside the polling station at Pakeman Primary School in Islington, London. Photo: Joe Giddens/PA Images via Getty Images
Philip, 61, and Julie Jones, 60, outside the polling station in Nenthead, on the Cumbria and Northumberland border
Voters outside the polling station in Nenthead, on the Cumbria and Northumberland border in northern England. Photo: Owen Humphreys/PA Images via Getty Images
SNP leader Nicola Sturgeon casts her vote in the 2019 General Election at Broomhouse Park Community Hall in Glasgow
Scottish National Party leader Nicola Sturgeon casts her vote in Glasgow. Photo: Andrew Milligan/PA Images via Getty Images
Nuns leave after voting at St John's parish hall polling station in London as Britain holds a general election on December 12
Nuns leave a London polling station. Photo: Niklas Halle'n/AFP via Getty Images
A voter carries his dog with a pro-EU sticker on his coat at the polling station at Pakeman Primary School, Holloway on December 12, 2019 in London, England.
A voter carries his dog with a pro-EU sticker on his coat at the polling station at Pakeman Primary School in Holloway, London. Photo: Peter Summers/Getty Images
Brian Mansley carries a sign, one of hundreds that are being dispatched to polling stations around Scotland from the Old Royal High School in Edinburgh
Brian Mansley carries a sign in Edinburgh, one of hundreds that are being dispatched to polling stations around Scotland. Photo by Jane Barlow/PA Images via Getty Images
An early voter at a polling station in Whitley Bay, northeast England.
An early voter at a polling station in Whitley Bay, northeast England. Photo: Owen Humphreys/PA Images via Getty Images

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