“every one has taken their intelligence daily brief because that sets the agenda for what you have to focus on as president of the United States”
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This is why Donald Trump is not taking the PDB: The Intelligence Community tries to “set the agenda”.
Addendum...
If The Donald is shrewd (and I sincerely believe he is) he will not fully trust any advice that comes from a current or former CIA Director (including and especially GHWB).