Prosecutors say the shooting suspect took a photo of himself in a hotel mirror before he tried to assassinate U.S. President Donald Trump.

The gunman did not make it inside the hotel ballroom where President Trump, top officials and hundreds of journalists had gathered for dinner.

Documents tied to the suspect also outline security breaches that the writer said made it easier than he expected to get firearms into the hotel where the president was set to speak at a dinner.

The gunman will be arraigned Monday on at least two charges, Jeanine Pirro, U.S. attorney for the District of Columbia, said.

The details, combined with video, seem to suggest that the gunman was not the person who shot an officer in his protective vest.

The footage shows Allen walking calmly through the hallways a day earlier, entering a nearby gym and speaking with an attendant before leaving. The post WATCH: Pulse-Pounding New Footage Shows WHCA Gunman Casing Hallway,

A federal law enforcement official confirmed the name of the alleged gunman as Cole Tomas Allen, of Torrance, California.

The FBI says the gunman in the Brown University mass shooting did not act randomly.