WASHINGTON (AP) — The Justice Department has opened an investigation into whether E. Jean Carroll, the longtime advice columnist who has said Donald Trump sexually assaulted her in a New York department store 30 years ago, lied during the course of civil litigation against the Republican president, according to a person familiar with the matter.

The person who confirmed the existence of the investigation was not authorized to publicly discuss an ongoing inquiry and spoke on the condition of anonymity. The perjury investigation is being led by the federal prosecutors’ office in Chicago, and acting Attorney General Todd Blanche has had no involvement because of his prior work as Trump’s personal attorney, the person said.

Lawyers for Carroll did not immediately respond to requests for comment from The Associated Press on Thursday.

The Justice Department is scrutinizing a statement Carroll made in the course of the civil litigation that no one else was paying her legal fees. It later became public that a Chicago-based organization backed by Reid Hoffman, the co-founder of LinkedIn, had helped fund Carroll’s case. Trump’s lawyers in the civil case accused Carroll of concealing that information, which they said called into question whether the case was politically motivated.

A court entry earlier this month said Trump won’t have to pay the award until the U.S. Supreme Court gets a chance to review the case or reject an appeal. The 2nd U.S. Circuit Court of Appeals agreed to a request by one of Trump’s lawyers that it let the president delay the payment to Carroll, though it required that he post a $7.4 million bond to cover any additional interest costs, a request Carroll’s attorney had made.

The Carroll investigation was first reported by CNN.