A series of missteps taken by FBI Director Kash Patel in the immediate aftermath of conservative activist Charlie Kirk's slaying could haunt the federal government's prosecution of Kirk's killer, according to a former federal prosecutor.

Glenn Kirschner, the former Deputy U.S. Attorney for Washington, D.C., joined progressive YouTuber Brian Tyler Cohen on a new episode of "The Legal Breakdown" on Monday to discuss Patel's handling of Kirk's assassination last week. Kirschner described some of Patel's moves as "reckless and incompetent."

For instance, Kirschner pointed to Patel's social media posts, one of which says the FBI had a "subject" in custody related to Kirk's murder and another one that says the FBI let the suspect go.

Kirschner said this move was "not a small mistake" and could give the shooter's defense attorneys a way to sow doubt about the charges against their client.

"All the defense attorney would have to do, courtesy of Kash Patel's reckless post...is succeed in creating a little bit of doubt, reasonable doubt in the mind of one of the 12 jurors," Kirschner said. "And then what do you have? You have a hung jury and a mistrial courtesy of Kash Patel's recklessness and incompetence."

"This is not a small mistake," he added. "This is a colossal bungle by Kash Patel."