On the heels of the assassination attempt of former President Donald Trump over the weekend, federal investigators are working to answer a host of questions regarding the incident, including whether the security detail and other law enforcement followed all safety protocols correctly.

Jillian Snider, an adjunct lecturer with John Jay College at Criminal Justice and a retired NYPD officer who for 15 years worked security detail at the U.N. General Assembly, said an investigation could take months.

She did, however, offer some analysis on what took place in the moments immediately after gunfire broke out at a political rally.

“The Secret Service that were on stage around former President Trump, they did their job. They did it well. They immediately created that barrier around him to keep him safe from any other harm,” Snider said, adding, “but you have a different team that’s going to establish that safety zone well in advance of the event.”

The FBI early Sunday identified the suspected shooter as Thomas Matthew Crooks, 20, of Bethel Park, Pa. He was killed by the U.S. Secret Service moments after he allegedly fired at the former president.

Trump is still set to appear at the Republican National Convention Monday in Milwaukee, Wisconsin. The Secret Service has said they are not amending their security plan at the event despite the recent events.

Snider said she agreed on keeping the plan in place.

“It would actually be somewhat dangerous to try and do any major alteration to safety plans that are in place. They’ve been working toward this. We have Secret Service as well as local, city law enforcement agencies that have been planning this, have been scouting out vulnerabilities, have been identifying any potential threats, doing threat assessments of individuals and locations within where the Republican National Convention will be placed, so I think it would be, kind of like I said, dangerous to change anything now,” Snider said.