NEW: Sen. Josh Hawley slams acting Secret Service head for not firing agents: ‘What more do you need to know?’

Hawley laid into Secret Service Acting Director Ronald Rowe in his questioning, asking, "Who is the lead site agent who decided to leave the AGR building completely outside the security perimeter? Who was that?"

When Rowe wouldn't answer who it was, Hawley followed up, asking, "Have they been relieved of duty?"

"Senator, they have not been relieved of duty," Rowe answered.

Hawley commented, "I know their name by the way. Why have they not been relieved of duty?"

The Missouri Senator continued along these lines, asking about several others who made decisions in the process, asking why the agents had not been fired or relieved of duties. Rowe repeatedly pushed back, saying that the agency had to do a full investigation to determine who was at fault and could not answer multiple questions.

Hawley got fed up with asking if people had been fired and said, "What more do you need to investigate to know that there were critical enough failures that some individuals ought to be held accountable?" The exchange between Hawley and Rowe got particularly heated when Hawley demanded the security head “fire somebody.”

"I will tell you, senator, that I will not rush to judgment, that people will be held accountable, and I will do so with integrity and not rush to judgment and put people unfairly prosecuted," Rowe responded.

In his opening statement, Rowe said, "I went to the roof of the AGR building where the assailant fired shots and laid in a prone position to evaluate his line of sight. What I saw made me ashamed. As a career law enforcement officer, and a 25-year veteran with the Secret Service, I cannot defend why that roof was not better secured."