President Trump is moving to revive the watchdog agency that oversees major surveillance programs, but some privacy advocates see his pick to lead it as overly deferential to the intelligence community. Adam Klein, nominated Friday to serve as chairman of the Privacy and Civil Liberties Oversight Board, has taken sides in one of the biggest policy debates this year: whether authorities need a warrant to search American communications collected "incidentally" under Section 702 of the Foreign Intelligence Surveillance Act, which expires later this year unless Congress acts.