London — Evidence is mounting that the plot to oust UK Prime Minister Theresa May is faltering. To trigger a vote of no confidence in her leadership, a total of 48 Conservative legislators need to submit letters, texts or e-mails calling for one. Late last week, as the backlash against May’s Brexit deal gathered pace, there was speculation that the threshold could be reached at any moment. However, by Monday, the Brexiteers appeared distinctly less ebullient as they had failed to reach their target, according to a person familiar with the situation. That doesn’t mean everything is going May’s way. On Monday evening, Northern Ireland’s Democratic Unionist Party (DUP), which has a formal agreement to vote with the Conservatives on budget matters, abstained and voted against the government on amendments to the treasury’s Finance Bill. DUP Brexit spokesperson Sammy Wilson told the BBC that the votes were “designed to send a political message” about their unhappiness with May’s Brexit de...

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