washington u.s. intelligence officials concern donald trump shoot hip style could pose national security risk prepare give routine pre-election brief formally anoint republican presidential nominee eight senior security officials tell reuters concern brief trump whose brash unpredictable campaign style feature rise insurgent candidate despite worry officials say top secret brief candidate would deviate usual format avoid appearance bias officials ask anonymity discuss domestic political issue current former officials say scandal hillary clinton use email also raise concern handle sensitive information likely democratic nominee face fbi probe whether security compromise laws break use private email server government business secretary state candidate prove incapable handle sensitive information hillary clinton say michael short spokesman republican national committee anyone worry hillary clinton trump lack foreign policy experience volatile style little know team foreign policy advisers make unique case officials say people nervous say one senior u.s. security official intelligence security foreign policy officials also try determine trump team trustworthy official add never situation like ever spokesperson trump campaign respond request comment officials downplay worry note traditional brief classify top secret mostly broad overview national security issue include sensitive government secrets intelligence source operations post-second world war era confirm u.s. presidential nominees traditionally receive brief intelligence officials include spy agency chiefs cover broad range national security issue nominees usually brief shortly party nominate conventions allow include one two aid must undergo security check current former officials say nominees explicitly warn share content brief include detail intelligence assessments election day presidents-elect receive presidential daily brief pdb sit president get complete material intelligence agencies source methods covert operations rep. adam schiff top democrat house intelligence committee tell reuters share concern trump never hold public office might use information brief would concern mr. trump ability know discuss publicly content intelligence brief say schiff endorse clinton president schiff say one consequence intelligence agencies worry trump reputation loose cannon could briefers circumscribe information provide trump hillary clinton prospective democratic opponent trump tend make broad-brush statements foreign issue rather delve policy nuances draw criticism former national security officials last month without evidence quickly tweet down egyptair flight appear terrorist attack clinton hone national security key potential weakness trump set deliver foreign policy speech thursday design portray billionaire businessman unfit white house officials familiar view policy director national intelligence jam clapper office give in-person brief say utmost avoid suggestions political favoritism bias officials say spy agencies intend follow past practice give identical brief nominees one former intelligence official say clinton could advantage brief would likely ask probe question trump newcomer foreign policy brief provide overview press issue hot spot around world say former cia officer david pry brief attorneys general fbi directors presidents one u.s. intelligence official say trump style may risk brief general nature often track publicly available information read paper every day hear much surprise official say current former officials say covert operations intelligence agencies source methods among nation tightly guard secrets never discuss pre-election brief officials worry brief trump fear spill secrets