“We now can establish that a pellet that came from the buckshot from the defendant’s Mossberg pump-action shotgun was intertwined with the fibre of the vest of the Secret Service officer,” Pirro said during an appearance on CNN’s “State of the Union.”

“It is definitively his bullet,” Pirro said.

Cole Tomas Allen is accused of storming a security checkpoint and firing a shotgun in the foyer leading to the White ​House Correspondents’ Dinner on April 25.

Allen is charged with attempted ⁠assassination, ​discharging a firearm during a crime ​of violence and illegally transporting guns and ammunition across state lines. He has not yet entered a plea.

Acting US attorney general Todd Blanche said on Sunday that there could be more charges filed as the investigation continues.

“I expect in the next week or so, there will be more information coming out.

“Obviously, assuming the investigation moves forward, there will be an indictment forthcoming. And all that is typical of what happens,” Blanche said on NBC’s “Meet the Press”.