President Trump on Wednesday told the crowd at the Republican National Committee’s first midterm convention in Dallas not to boo the absent Senate Majority Leader John Thune (R-S.D.), telling them that “John is working hard.” Trump mentioned Thune’s name after he said Speaker Mike Johnson (R-La.) “will go down as the greatest Speaker of the House in the history of our country.” He then added that Thune was “here” before asking where he was, prompting boos from the audience.The president added that Senate Republicans will in general have “great, great success.” Thune and Trump have been at odds with each...