"That was unique," Ronald Rowe Jr., the acting director of the Secret Service, said Friday.
The Secret Service has faced intense scrutiny in the wake of the incident.
The Secret Service initially blamed local law enforcement but later conceded it was ultimately the agency's responsibility to ensure the building was covered.
Secret Service personnel were in one command post, with a member of the Pennsylvania State Police, and their local partners were in an entirely separate space.
Secret Service Director Kimberly Cheatle resigned last month in the wake of the attack and after a contentious House hearing about the attempt.
Persons:
Donald Trump, Ronald Rowe Jr, Lester Holt, Trump, Thomas Crooks, Rowe, Crooks, —, Kimberly Cheatle, countersniper, Butler
Organizations:
Service, NBC, Secret Service, Pennsylvania State Police, Secret, Crooks
Locations:
Butler