Members of the Secret Service look out from the roof of the White House on Thursday. Security measures have been increased following two incidents at the mansion last week. (Michael Reynolds/EPA)

Deputy National Security Adviser Tony Blinken was asked about the Secret Service and recent revelations about security issues at the White House on CNN's "State of the Union" on Sunday.

The Washington Post reported on the Secret Service's slow response to gunfire in 2011 this weekend.

"Their task is incredible, and the burden that they bear is incredible," Blinken told host Candy Crowley. "Director [Julia] Pierson has been looking at this incident. And then what we saw last week, she reported to the president on Thursday evening when he got back from New York. The Secret Service is investigating this and they will take any steps necessary to correct any deficiency.

More recent lapses at the White House have led to increased scrutiny of those who protect the President. Earlier this month, a man jumped the White House fence and reached the unlocked front door.

The Washington Post's report of the 2011 shooting said that "the actions of the Secret Service in the minutes, hours and days that followed the 2011 shooting were particularly problematic."

Officers who were on the scene who thought gunfire had probably hit the house that night were largely ignored, and some were afraid to dispute their bosses’ conclusions. Nobody conducted more than a cursory inspection of the White House for evidence or damage. Key witnesses were not interviewed until after bullets were found.

Moreover, the suspect was able to park his car on a public street, take several shots and then speed off without being detected. It was sheer luck that the shooter was identified, the result of [Oscar R. Ortega-Hernandez], a troubled and jobless 21-year-old, wrecking his car seven blocks away and leaving his gun inside.