- White House intruders
"Most White House intruders do not try to harm the President (who may not even be in residence), but are usually attempting to attract attention to their causes or ideas (e.g. Anthony Henry) or are intruding accidentally (e.g. a plane inadvertently flying into White House airspace). There have been four assassinations of U.S. presidents and many more assassination attempts. None of the assassinations occurred at the White House, and only one attempt occurred there..."
White House shooting: Secret Service stops armed man - 21 May 2016
The White House has seen a number of security incidents in recent years, prompting changes at the executive complex.
In April, Secret Service caught an intruder climbing over the White House fence.
In 2014, Iraq War veteran Omar Gonzalez jumped the White House fence and ran into the building with a knife. Also that year, a toddler squeezed through the gates of the fence and was caught on the lawn.
In 2013, one man tried to crash a jeep filled with knives and bullets into a security gate.
In 2011, Oscar Ortega-Hernandez shot at the White House and was charged with attempting to assassinate Mr Obama or a member of his staff."
Secret Service officers struggle behind the scenes - 23 September 2014
"The break-in at the White House makes the US Secret Service look terrible.
It also sheds light on an agency that operates largely behind the scenes."
- White House intruder 'had ammo and a machete in his car' - Article + Video - 22 September 2014
"The man who broke into the White House on Friday evening had 800 rounds of ammunition, a machete
and two hatchets in his car, authorities have said."
- White House security stepped up after intrusions - 21 September 2014
"The US Secret Service says it has stepped up security at the White House
and launched a "comprehensive review" of procedures there after two attempted breaches in 24 hours."