Pierson 's future in question . NEW : Whistleblower says an armed contractor was allowed on an elevator with Obama . Secret Service chief says agents used `` restraint in making a very difficult decision '' Darrell Issa entered Secret Service via unlocked door , Netherlands tells congressional committee . Rep. Darrell Issa cites instances of `` misbehavior '' that undermine trust in White House .
NEW : Whistleblower says an armed contractor was allowed on an elevator with Obama . Secret Service chief says agents used `` restraint in making a very difficult decision '' Darrell Issa entered Secret Service via unlocked door , Netherlands tells congressional committee . Rep. Darrell Issa cites instances of `` misbehavior '' that undermine trust in White House .