WASHINGTON — A top aide to U.S. Attorney Jeanine Pirro said in a phone call Monday night that prosecutors had made a “f---up” in a high-profile criminal case against two former FBI officials , an agent who’s been investigating the case testified Thursday.

The former officials, Nikki Floris and Bradley Benavides, were initially charged last week with making false statements to Congress about their level of knowledge about an investigation of Hunter Biden’s laptop.

A sworn affidavit attached to the complaint by Special Agent Ryan Witt cited a congressional staffer who was present for both Floris’ and Benavides’ testimony — but it turns out the person was only present for Benavides’, Witt testified at a preliminary hearing on whether there’s probable cause to charge the pair.

Witt told Magistrate Judge Zia M.…