WASHINGTON: The US President's schedule on any given morning includes a confidential Presidential Daily Briefing (PDB) at 9 am before he embarks on the day's (mostly) public engagements. Presented usually by the Director of National Intelligence, the PDB fuses intelligence from various spy agencies (CIA, DIA, NSA etc), much of it obtained through "sigint" (signal intelligence) and "'technical" means (euphemism for bugging, electronic surveillance etc), to give the President a head's up on vital national security issues - from nuclear advances in countries such as Pakistan, North Korea and Iran to negotiating positions of China, India, and other majors at...