High-profile MAGA personalities applauded Friday as President Trump escalated his hostility toward Ukrainian President Volodomyr Zelensky. Mr. Trump wrote on social media that Mr. Zelensky “disrespected the United States in the cherished Oval Office” and “can come back when he is ready for Peace.” That followed a hostile meeting in which Mr. Trump and JD Vance berated and bullied Mr. Zelensky, with the vice president demanding: “Have you said thank you once?” In the days leading up to the meeting, Mr. Trump described Mr. Zelensky as a “dictator” and suggested that Ukraine started the war with Russia. Along with the...