The employment documents of related to immigrants who worked illegally at President Donald Trump’s golf club in New Jersey have been gathered by the FBI and state investigators, reports the Washington Post.

The report is sourced to a Newark attorney who represents five undocumented immigrants that worked at the Trump National Golf Club in Bedminster, New Jersey.

The lawyer says that in November he met with investigators from the New Jersey state attorney general’s office and two FBI agents.

Among the documents reviewed were fake green cards and Social Security numbers that the workers say supervisors at Trump’s golf club gave to a Guatemalan worker.

“The materials collected by law enforcement agencies, first reported by the New York Daily News, indicate that investigators may be launching a probe into the hiring practices of the president’s golf club,” the Post writes.

The FBI and state investigators did not comment.