What a difference twenty-four hours makes. Yesterday, President Donald Trump was walking back his recent criticisms of Ukrainian President Volodymyr Zelenskyy, going as far as to say he could not believe that he had called Zelenskyy a “dictator.” Today, Trump held an acrimonious meeting with Zelenskyy that culminated in Ukrainian president being asked to leave the White House and a joint press conference being canceled. The Trump-Zelenskyy meeting before the press pool spray, which Vice President JD Vance joined, has no precedent. Heads of government generally do not bicker in front of the cameras. But in today’s meeting, Trump accused...