US President Donald Trump said he had run into Florida High School, where 17 people were shot, even if he was not armed.
"I really think I would run in there, even if I did not have a gun," Mr. Trump told a group of states governors gathered in the White House.
Mr. Trump also said it was "disgusting" that the officers reportedly were not confronted with the suspect on February 1
The massacre was the second-deadliest shooting at a US school.
"I think most people in this room would have done that too," Trump said on Monday, claiming he had come to school.
He added, "You never know until you're tested."
A Am On Sunday, the state investigation was launched to investigate the massacre at Marjory Stoneman Douglas High School.
Scot Sherston, a deputy sheriff's officer assigned to high school, resigned last week when he found out that he had stayed outside Building 12, where most of the students were killed by the ex-student  had previously suggested that the measures taken on that day by Mr. Peterson – who has since withdrawn from the troop – could have turned him into a "coward".
The Broward County Sheriff Office reportedly investigated why three of its deputies apparently remained outside the building with their guns drawn while the attack unfolded.
Mr. Trump also criticized these officers, saying that they were "not exactly honorary medalists" – a reference to the US Military Prize for Valor.
"The way they do it," Mr. Trump added.
An attorney for Mr. Peterson – a 32-year-old police veteran – rejected Mr. Trump's allegation and said his client had been "vilified" by his former boss, Sheriff Scott Israel.
"Let it be no mistake, Mr. Peterson wishes that he could have prevented the premature death of the seventeen victims on that day, and his heart goes to the families of the victims in their time of need," said his lawyer Joseph DiRuzzo III , 19659004] "Allegations that Mr. Peterson was a coward and his performance under the circumstances did not meet police standards are obviously untrue."
"Mr. Peterson is confident that his actions on that day will be appropriate in the circumstances and that the video (along with the testimony of those involved) will relieve him of any inferior performance, "said the lawyer (19659004) Sheriff Israel has kept out of the criticism in calling for his resignation and said that he is not for the
"I have given this authority an amazing leadership," he said during an interview with CNN on Sunday, insisting that he does not intend to quit.
Students are preparing to return to their classes full-time on Wednesday after some have visited a voluntary "orientation" on Sunday.
"It's like the first day of school," a 16-year-old girl told the New York Times
"But it's not normal at all."