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TOPSHOT - Marjory Stoneman Douglas High School staff, teachers and students return to school greeted by police and well wishers in Parkland, Florida on February 28, 2018. 
Students grieving for slain classmates prepared for an emotional return Wednesday to their Florida high school, where a mass shooting shocked the nation and led teen survivors to spur a growing movement to tighten America's gun laws. The community of Parkland, Florida, where residents were plunged into tragedy two weeks ago, steeled itself for the resumption of classes at Marjory Stoneman Douglas High School, where nearby flower-draped memorials and 17 white crosses pay tribute to the 14 students and three staff members who were murdered by a former student.
 / AFP PHOTO / RHONA WISE        (Photo credit should read RHONA WISE/AFP/Getty Images)
RHONA WISE/AFP/AFP/Getty Images
TOPSHOT - Marjory Stoneman Douglas High School staff, teachers and students return to school greeted by police and well wishers in Parkland, Florida on February 28, 2018. Students grieving for slain classmates prepared for an emotional return Wednesday to their Florida high school, where a mass shooting shocked the nation and led teen survivors to spur a growing movement to tighten America's gun laws. The community of Parkland, Florida, where residents were plunged into tragedy two weeks ago, steeled itself for the resumption of classes at Marjory Stoneman Douglas High School, where nearby flower-draped memorials and 17 white crosses pay tribute to the 14 students and three staff members who were murdered by a former student. / AFP PHOTO / RHONA WISE (Photo credit should read RHONA WISE/AFP/Getty Images)
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This image made available by the Broward County Sheriff's Office on Sunday, Feb. 18, 2018, shows Sheriff Scott Israel, holding the hand of Anthony Borges, 15, a student at Marjory Stoneman Douglas High School. The teenager was shot five times during the massacre on Valentine's Day that killed 17 students. Borges is being credited with saving the lives of at least 20 other students. (Broward County Sheriff's Office via AP)
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This image made available by the Broward County Sheriff's Office on Sunday, Feb. 18, 2018, shows Sheriff Scott Israel, holding the hand of Anthony Borges, 15, a student at Marjory Stoneman Douglas High School. The teenager was shot five times during the massacre on Valentine's Day that killed 17 students. Borges is being credited with saving the lives of at least 20 other students. (Broward County Sheriff's Office via AP)
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(CNN) —  

President Donald Trump said Friday that the armed school resource officer who stayed outside Marjory Stoneman Douglas High School as last week’s shooting unfolded did a “poor job.”

“When it came time to get in there and do something, he didn’t have the courage or something happened, but he certainly did a poor job. There’s no question about that,” Trump said of Scot Peterson on the White House South Lawn before leaving to speak at CPAC.

“But that’s a case where somebody was outside, they’re trained, they didn’t react properly under pressure or they were coward,” Trump added. “It was a real shot to the police department.”

Trump continued to criticize Peterson while speaking later Friday at the Conservative Political Action Conference.

“He didn’t turn out to be too good, I’ll tell you that. Turned out to be not good, not a credit to law enforcement, that I can tell you,” he said.

The comments come as he has called for “hardened” schools with armed teachers to act as a deterrent and, if necessary, a last resort to fire back at shooters.

Peterson, the resource deputy at the Parkland, Florida, high school, waited outside the building as Nikolas Cruz fired shots, killing 17 people last week, officials said Thursday. Peterson resigned after he was suspended without pay.

Broward County Sheriff Scott Israel said Thursday that Peterson remained outside “for upwards of four minutes.” The shooting, Israel said, lasted six minutes.

CNN’s calls to Peterson on Thursday were not returned.

CNN’s Allie Malloy contributed to this report.