Politico said Monday that its top U.S. editor was stepping down and would be replaced by one of the publication’s co-founders, John Harris, who will also take on additional responsibilities for Politico’s international editions.Matt Kaminski, who joined Politico nearly a decade ago from The Wall Street Journal, will conclude his tenure as editor in chief at the end of August, Goli Sheikholeslami, Politico’s chief executive, said in an email to the staff Monday.Ms. Sheikholeslami said in her memo that the new role for Mr. Harris, who had been serving as editorial chair, would be expanded to include all of Politico’s editorial units under his purview.“To be clear: John is not returning to a job he once had,” Ms. Sheikholeslami …
