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During a general election, the sitting President makes the decisions to what the two final candidates to replace him do or don’t get to know when it comes to national security developments.
...he can decide what is in the briefings, but both candidates will receive the same information
Here's why you shouldn't worry about Clinton and Trump receiving top-secret intelligence briefings
Presidential candidates Hillary Clinton and Donald Trump will begin receiving top secret briefings from the US intelligence community in the coming days, and that's leading some big names in Washington — and some people around the country — to say they shouldn't go forward because neither candidate can be trusted with sensitive classified information.
http://www.businessinsider.com/clinton-trump-receive-intelligence-briefings-people-not-trust-either-2016-8
...thus far the only candidate who has been accused of being careless with national security is HIllary.
FBI Director Comey just dropped some shockingly scathing comments about Hillary Clinton’s email setup
https://www.washingtonpost.com/news/the-fix/wp/2016/07/05/inside-james-comeys-shockingly-scathing-comments-about-hillary-clintons-email-setup/