FBI Director's revelation politically motivated

See this article. Last Friday the FBI director Comey sent a letter to Congress saying they found more emails "potentially pertinent" to the Clinton email investigation. And yet at that time, and as of Saturday night, the FBI had yet to produce the required search warrant to read any of the mails. So how the fuck could Comey say these emails were "potentially pertinent" when he in fact had zero idea of what was in them? The release of Comey's letter was also in violation of a strict Justice Dept. policy to not release information relevant to an investigation before an election because it gives the strong appearance of interfering with said election. It seems obvious that Comey's sole intent was to do that very thing.