President Donald Trump again insulted Texas Republican Senate candidate Ken Paxton, calling him “a pain in the a**” before wondering aloud, “Is he here, by the way?” The president has used similar lines countless times before, including at his Republican midterm convention in Dallas, where he declared, “He may not dress right. He may not talk exactly perfectly, and he may not be the best-looking guy I’ve ever seen, but you know what he is? He’s the greatest attorney general in America, and he deserves to be your next senator.” His latest remarks came as he returned to Denton, Texas,...