Candidate Briefings
Why should any presidential candidate get intelligence briefings? Why does any presidential candidate need to know what is going on in the world beyond what they can get from the news media? How does it make the country safer to give intelligence briefings to people who are not the President, members of the intelligence community, or members of the national security team? What good could come from giving presidential candidates intelligence briefings? What could change? Neither candidate has the power to make a decision if something were to happen. Neither one of the candidates is in the governmental chain of command. Therefore, if the President or Vice President were unable to perform the duties of their jobs, neither of them would be appointed President. So, what is the point of giving them intelligence briefings?
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That Obama does not brief Trump.
If he does - then high level language . . . that Clinton would understand as she worked so closely with him. Whatever he does or does not give Trump would have to be on par with what he gives Clinton. He has too much integrity to allow two separate briefings. 
In this election - I'd prefer none be given. Just ride it out. November to January is plenty of time.
There is nothing that legally be done to President Obama if he does NOT brief the candidates. He is not bound by a single law, the constitution, etc. etc.
& I believe a former Prez would be helpful as long as needed.
I think it started after Roosevelt died, Truman became Prez having not being briefed on anything, including the atomic bomb.
The maggot would immediately be tweeting.
I also trust that whoever does the briefings will take the candidate into consideration & be VERY careful what they reveal
