Mark Sanford, a Republican former U.S. congressman from South Carolina, said on Tuesday he is considering mounting a primary challenge to President Donald Trump. Sanford, 59, a longtime Trump critic who lost his seat in the House of Representatives last year after he was challenged by a Trump supporter in the Republican primary, will decide in the next month whether to make a long-shot bid against Trump for the 2020 presidential nomination, he told the Post and Courier newspaper in Charleston, South Carolina. Sanford, who is also a former South Carolina governor, could not be reached immediately by Reuters for comment.