Nearly all Republican presidential candidates have either vowed to reform the top ranks of the FBI upon assuming office, enact sweeping structural reforms or dismantle the bureau entirely. Only one major GOP candidate — former New Jersey Gov. Chris Christie — has explicitly said he would not fire FBI Director Christopher Wray. Florida Gov. Ron DeSantis, former President Donald Trump, former Vice President Mike Pence, entrepreneur Vivek Ramaswamy, former U.N. Ambassador Nikki Haley and South Carolina Sen. Tim Scott have all vowed to get rid of the director as part of their plans to overhaul the bureau. Two other candidates...