Special counsel Robert Mueller has enough information on retired Lt. Gen. Michael Flynn, former national security adviser to President Trump, to charge him with a crime, according to a new report.

NBC News reported Sunday Flynn and his son, Michael G. Flynn, are in Mueller’s crosshairs a week after the special counsel announced three people were charged in his investigation into Russian meddling in the 2016 election.

Former Trump campaign chairman Paul Manafort, adviser Rick Gates were charged on Monday. On that same day, it was announced foreign policy adviser George Papadopoulos pleaded guilty to lying to the FBI.

Flynn is being investigated for possibly orchestrating the removal of a Turkish politician who is hated by Turkish President Recep Tayyip Erdogan from the United States to Turkey in exchange for millions of dollars.

Flynn’s son worked closely with his father and could be indicted at the same time as his dad.

Mueller’s team is interviewing witnesses close to Flynn in order to put more pressure on him.

According to the report, the FBI was asked after Trump’s inauguration to review Turkey’s 2016 request to extradite Fetullah Gulen to Turkey. Gullen is a Muslim critic living in Pennsylvania and Erdogan blames him for a 2016 coup attempt that failed.

It’s not clear if the request came from the State Department, as is normal, or from Flynn. The FBI pushed back against the request because there was no new information.

Former CIA Director Jim Woolsey accused Flynn of working with Turkish officials on a plan to remove Gulen from the United States during a 2016 meeting.

Flynn would be the first member of the Trump administration to be charged, if he is indicted. He served as Trump’s national security adviser for less than a month before being fired for lying to Vice President Mike Pence about his conversations with the then-Russian ambassador to the United States.