SUMMERVILLE, SC — Donald Trump, furious at sharp criticism from the Republican representing South Carolina’s 1st congressional district, has endorsed Katie Arrington in hopes of ridding the party of a libertarian-leaning member who was one of the few dissenting voices regarding Trump’s fitness. lead. The year was 2018. The congressman was Mark Sanford, who had become increasingly critical of Trump for his conduct in office. Arrington, then a state representative, was backed in hopes of unseating Sanford. She did so in the June primary, only to lose the election in the fall. The dynamic seems to be repeating itself four...