The California man who authorities say rushed toward the White House Correspondents’ Association dinner armed with guns and knives faces three criminal charges, as federal prosecutors on Monday accused him of trying to assassinate President Donald Trump and target other administration officials.

The defendant, Cole Allen, who appeared in court in Washington and was held without bond, was charged with the attempted assassination of the president, along with two firearm-related counts.

Jeanine Pirro, U.S. Attorney for the District of Columbia, said at a press conference Monday that there would be additional charges as the investigation unfolds. “This was an attempted assassination of the president of the United States, with the defendant making clear what his intent was, and that intent was to bring down as many of the high-ranking Cabinet officials as he could,” she said.

Allen is accused of running past a security checkpoint at the Washington Hilton on Saturday night while armed with firearms and knives, an incident that prompted gunfire and spurred security forces to evacuate Trump, Vice President JD Vance and Trump Cabinet officials out of the ballroom where journalists and senior government officials had gathered for the dinner.

Allen, who was a hotel guest, approached the security checkpoint at around 8:40 p.m. and ran through a magnetometer holding a long gun, according to a federal affidavit released Monday.

Authorities said Secret Service personnel assigned to the checkpoint heard a loud gunshot at that time, and an officer was shot once in the chest but was wearing a ballistic vest, the affidavit said.

The officer fired multiple times at Allen, who was not shot but instead fell to the ground and was arrested, authorities said. The document did not state whether it was Cole who fired at the officer.

The federal affidavit also provided insight into the timeline of Cole’s movements ahead of the dinner and what authorities say was his motivation for rushing toward the ballroom.

Cole, according to an affidavit, sent an email to family members and a former employer shortly before he rushed past the checkpoint, an email that included a text file entitled: “Apology and Explanation.”

The note, according to the affidavit, had his “expected rules of engagement,” stated that administration officials “are targets, prioritized from highest-ranking to lowest” and said Secret Service “are targets only if necessary, and to be incapacitated nonlethally if possible.”

“I would still go through most everyone here to get to the targets if it were absolutely necessary,” Cole wrote, according to the affidavit, adding that he hoped “it doesn’t come to that.”

The affidavit also included text of the scheduled email that Cole sent.

“I wish I could have said anything earlier, but doing so would have made none of this possible. My sincerest apologies for all the trouble I’ve caused,” read the message, according to the affidavit.

Authorities say Cole traveled by train from California to Chicago, and then to Washington, and had checked into the hotel on Friday, a day before the dinner.