A news report on Sunday revealed the US Security Service took five days to identify and respond to a 2011 shooting attack on the White House.
Citing investigators and other government officials, the Washington Post reported that security did not realise that seven bullets had hit the White House until five days after the incident, in which a gunman shot at the upstairs residence that houses the first family.
President Barack Obama and his wife Michelle were out of town when the incident occured, but their youngest daughter Sasha was at home.
The gunman, Oscar R Ortega-Hernandez, was arrested by "sheer luck" shortly after, the report claims, after he crashed his car several blocks away from the White House. He had left his gun at the scene.
The report comes a week after an intruder armed with a knife was able to cross a White House fence and enter the building through an unlocked door.
The lax security measures and lack of response in both cases have caused public concern about the competence of the elite law enforcement agency responsible for White House security.