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Former U.K. Prime Minister Keir Starmer at the Élysée Palace in Paris on April 17. Photo: Bastien Ohier/Hans Lucas/AFP via Getty Images

British Prime Minister Keir Starmer resigned Monday after weeks of turmoil within his government, setting the country up to find its seventh leader in the last decade.

Why it matters: The Labour Party, which Starmer currently leads, must quickly choose a new leader as the U.K. faces an economic crisis tied to the war in Iran.