The FBI has arrested the Texas real estate developer embroiled in Attorney General Ken Paxton’s historic impeachment, shortly after details of the pair’s unsavory business dealings emerged.

Federal agents took 36-year-old Nate Paul into custody Thursday afternoon and booked him into jail in Austin, Texas, Travis County Sheriff’s Office records show.

Details of the political donor’s charges were not clear, but federal records Friday showed he was being held in connection with a felony.

Details of Paul’s nefarious dealings with the embattled Republican AG came to light in late May, when Paul was accused of giving Laura Olson — Paxton’s “on and off” mistress — a job in exchange for help.

“Nate Paul giving his mistress a job means that he no longer has to drive back and forth from San Antonio to see her, and it makes her more convenient [if she is] here in Austin,” Texas Rep. Ann Johnson of Houston said of the scheme, one of multiple accusations made as part of the impeachment scandal.

Meanwhile, Paul was for years the subject of a different, undisclosed federal investigation in which Paxton had also been involved.

The AG’s involvement in the federal probe is said to have set off the series of events leading to his historic impeachment.

Federal agents searched his Austin manse and real estate offices in 2019 and 2020 after eight of Paxton’s deputies reported their boss — the top law official in the state — to the FBI on suspicions of bribery and abuse of office.

Their allegations against Paxton included hiring an independent attorney to review the troubled real estate developer’s claims of agents’ wrongdoings.

The FBI probe into Paxton’s actions in connection with Paul remains ongoing.

Paul has denied bribing Paxton and the AG has since released evidence his attorney says shows he was not bribed.

Paxton was the third sitting Texas official to be impeached in the state’s history.

The 20 articles of impeachment also detail allegations of Paxton’s use of his office’s power to help Paul in connection with unproven claims of a $200 million conspiracy against him.

Paxton has been suspended from the office until his trial, which is expected to begin no later than the end of August.

With Post wires.