Mark Sanford performs his own political autopsy. Cause of death: Tweet by Trump.

Rep. Mark Sanford (R-S.C.) will not exactly be writing his own version of What Happened following his bruising loss to Katie Arrington in South Carolina's GOP primary on Tuesday. Sanford told The Washington Post that he blames a tweet by President Trump for his losing re-election bid. Other Republicans running for office "don't want the tweet I got last night," said Sanford, who has long been an outspoken critic of the president.

Just three hours before the polls closed in South Carolina, Trump tweeted: "Mark Sanford has been very unhelpful to me in my campaign to MAGA. He is MIA and nothing but trouble. He is better off in Argentina." Sanford, whose 2009 extramarital affair with a woman in Buenos Aires nearly tanked his political career, had never before lost an election until conceding to Arrington on Tuesday.

Sanford won his last re-election, in 2016, with a 22-point victory, although he sensed that he was going to lose before the race was called Tuesday night. "The idea of some allegiance not to the Constitution, but to the president, was not what I signed up for," Sanford told the Post.

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