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. Photo: Steve Parsons/PA Images via Getty Images
A man arrives to vote at a polling station in Furnace, near Inveraray, Scotland. Photo: Paul Ellis/AFP via Getty Images
Labour Party leader Jeremy Corbyn arrives to vote in north London. Photo: Daniel Leal-Olivas/AFP via Getty Images
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
Voters outside the polling station in Nenthead, on the Cumbria and Northumberland border in northern England. Photo: Owen Humphreys/PA Images via Getty Images
Scottish National Party leader Nicola Sturgeon casts her vote in Glasgow. Photo: Andrew Milligan/PA Images via Getty Images
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 in Holloway, London. Photo: Peter Summers/Getty Images
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. Photo: Owen Humphreys/PA Images via Getty Images

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