A prominent former U.S. State Department official who worked to fight Russian disinformation has labeled the Trump presidential campaign an “influence operation,” with several experts echoing his assessment. Richard Stengel, an NBC News/MSNBC analyst who spent seven years as TIME magazine managing editor and served as the chief executive of the National Constitution Center, on Thursday shared his evaluation. “The Trump candidacy is not so much a political campaign as what intelligence services call an influence operation, a coordinated effort to use mis-and-disinformation to undermine democrat…