For the second time in her brief premiership, Theresa May faces a battle for survival. If she prevails, it will be as the leader of a new political construct in Britain: the single-party coalition government. Ever since the disastrous 2017 election, in which her Conservative Party lost its parliamentary majority and the prime minister faced calls to resign, the government has resembled a giant scrum. Heavyweights on both sides of the Brexit divide — those who want a hard, clean break with Europe and those who want the closest ties consistent with leaving — have vied for dominance.

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