Republican lawmakers are probing an FBI request for travel records on Shamsud-Din Jabbar who killed 14 people in New Orleans  — after bureau investigators acknowledged later to lawmakers the ISIS-inspired maniac was not on any terror watchlist.

US Customs and Border Protection (CBP) created a record at 11:06 a.m. ET on Jan. 1 to retrace Jabbar’s steps, an official confirmed Thursday to The Post, providing an answer to a query from House Republican lawmakers two days before about whether the feds were monitoring the terror suspect before he struck.

Reps. Mark Green and August Pfluger revealed in a Tuesday letter that the House Homeland Security Committee recently learned about the FBI’s possible effort to monitor Jabbar’s travel starting on Dec. 31 — hours before he mowed down dozens of New Year’s revelers on Bourbon Street.

“It is unclear to the Committee at this time whether the creation of the travel record was a technical error in the system or was set as a one-year tracking period starting from the night before the terrorist attack to December 31, 2025,” the lawmakers wrote to FBI Director Christopher Wray and Homeland Security Secretary Alejandro Mayorkas.

The CBP official clarified to The Post: “When this record is viewed in certain other CBP systems, the time defaults to midnight Eastern Standard Time, which can appear a day earlier if viewed in other US time zones.”

The Republican lawmakers in their letter demanded all federal records about Jabbar’s travel in the FBI or Department of Homeland Security’s possession to assist in their investigation of the deadly New Year’s attack.

They also asked for information about the “explosive compounds” that the jihadist wired to a remote transmitter — and may have “never used before in the United States or Europe.”

The explosives, found both in coolers in the vehicle and hidden around the French Quarter, were never detonated because police shot and killed Jabbar before he pulled the trigger on the transmitter.

The GOPers further asked for potential “intelligence reports from a foreign government” about Jabbar that may have been shared with the US as well as “what the FBI has learned from the exploitation of the three cell phones recovered” from an Airbnb on Mandeville Street in New Orleans linked to him.

An FBI spokesperson told The Post Tuesday: “The FBI was not aware of Jabbar prior to the New Year’s Day attack and did not issue any advance warnings about him. The FBI will continue to keep Congress and the public informed as the investigation progresses.”

Jabbar — who proclaimed his allegiance to ISIS in chilling Facebook posts early on Jan. 1 and displayed a caliphate flag on the truck that he drove into the crowd of bystanders — visited the Big Easy before the attack: once on October 30 for at least two days, and a second time on Nov. 10.

On Sunday, the FBI released footage that Jabbar wore Meta smart glasses during one of those scouting trips.

The 42-year-old Houston resident had also traveled to Egypt for a week and a half starting on June 22, 2023, and separately, to Ontario, Canada, in July of that year, according to the FBI.

The last visit was just three years after Jabbar had left the Army, where he served for more than a decade as an active-duty IT specialist, stationed briefly in Afghanistan, before working as a reservist and retiring at the rank of staff sergeant.

“The Committee recognizes that law enforcement officials commonly create tracking records for suspects, whether alive or deceased, including travel monitoring records,” noted Green, who chairs the Homeland panel, and Pfluger, who chairs the panel’s subcommittee on counterterrorism, law enforcement, and intelligence.

“These records are often used after an attack to confirm the suspect’s identity or uncover possible associates, particularly when a deceased suspect’s identity is not yet fully verified or when there is a possibility of additional individuals being involved.”

House and Senate lawmakers were also briefed by the FBI assistant director in the counterterrorism division, David Scott, on Jan. 2 of the terror suspect’s absence from federal watchlists and other monitoring systems.