The FBI will investigate whether additional classified material is contained in emails sent using Hillary Clinton’s private email server while she was sectretary of state, FBI director James Comey informed Congressional leaders Friday. The announcement appears to restart the FBI’s probe of Clinton’s server, which previously ended in July with no charges. The explosive announcement, coming less than two weeks before the presidential election, could reshape a campaign in that Clinton, the Democratic nominee, had been leading in public polls. In a letter to congressional leaders, Comey said that the FBI had, in connection with an “unrelated case,” recently “learned...