fbi director jam comey undercut main arguments hillary clinton make defense use unauthorized private email system u.s. secretary state federal bureau investigation begin investigate clinton email system government watchdogs find message contain classify government secrets last year comey recommend clinton face criminal charge unusual step use news conference give public rebuttal tuesday defenses offer clinton last year seven time comey contradict clinton clinton say clinton say march 2015 return anything could possibly view work relate late swear oath return work email state department 2014 30,000 comey say fbi recover several thousand work email return state department comey reasonable confidence deliberate effort withhold message clinton say clinton repeatedly say send receive classify information private email system email release public mark classify retroactively upgrade comey say fbi find 110 email 52 email chain contain information classify time message send eight chain contain top secret information high level government classification another 36 chain contain secret information eight contain confidential information clinton say clinton repeatedly say send receive email mark classify comey say small number email mark contain classify information even information mark classify email participants know know subject matter classify still obligate protect comey say clinton say security integrity email system take seriously robust protections put place accord staff march 2015. comey say system even support full-time security staff like find departments agencies u.s. government even commercial service like gmail clinton say clinton say evidence ever breach email system comey say would unlikely find direct evidence clinton email system hack fbi believe possible hostile actors gain access hostile actors also gain access people clinton correspond email system clinton say certainly well aware classification requirements clinton say march 2015. comey say clinton colleagues extremely careless handle sensitive highly classify information clinton say clinton maintain email system allow nothing wrong also say mistake apologize comey say evidence clinton colleagues intend break law people engage similar activity often subject security administrative sanction factbox fbi vs. clinton seven point contention