"Obviously, the safety and security of the White House grounds is one of the missions of the United States Secret Service, we have full confidence in them to accomplish that," Schultz told journalists during a Wednesday press briefing.
Schultz added that the unmanned aerial vehicle technology is "not new to the Secret Service" and that they are constantly reviewing threats from emerging technologies.
Later it was discovered that the drone was operated by an employee of the National Geospatial-Intelligence Agency who was drinking at his apartment and lost control of the unmanned aerial vehicle.
The US Secret Service has recently come under scrutiny after a string of high-profile security lapses last year, including allowing a private security guard with a weapon and a criminal history board an elevator with US President Barack Obama and a man jumping a White House fence and getting into the East Room.
The blunders led to former Secret Service director Julia Pierson's resignation in October 2014 and several Secret Service executives" dismissal in January 2015.
