The lead prosecutor tasked with overseeing former FBI Director James Comey's prosecution stemming from his post of seashells that the Justice Department claims amounted to a threat against President Donald Trump has withdrawn from the case, according to a court filing.

Matthew Petracca was the lone prosecutor from the U.S. Attorney's Office for the Eastern District of North Carolina assigned to the case when it was unsealed late last month.

On Friday evening, however, the Justice Department filed a notice with the court indicating that Petracca has been replaced by assistant U.S. Attorney Timothy Severo.

The department did not include any explanation for the move in the high-profile case.

Comey's attorneys are expected to make a vigorous push to have the case dismissed before it can go to trial through a variety of legal challenges.