The federal government’s investigation into Russian meddling in the 2016 election, led by special counsel Robert Mueller, has topped $5 million in costs, according to a report.

The Justice Department is expected to release its first expense report related to Mueller’s investigation next week, but ABC News reported Friday the Russia probe currently has a price tag of more than $5 million.

Deputy Attorney General Rod Rosenstein tapped Mueller to serve as special counsel for the investigation in May. Since then, Mueller has hired more than 16 attorneys, with expenses for FBI agents, support staff, travel, office materials, and prosecutors.

So far in Mueller’s investigation, a federal grand jury has indicted former Trump campaign chairman Paul Manafort and business partner Rick Gates on 12 counts, including money laundering and tax evasion. Former Trump campaign foreign policy adviser George Papadopoulos also pleaded guilty to lying to the FBI about his contacts with Russia.

Mueller’s office announced Friday morning that Trump’s former national security adviser, Michael Flynn, had been charged with one count of “willfully and knowingly” making “false, fictitious and fraudulent statements” to the FBI regarding his contacts with Russia’s ambassador.

Flynn will appear in federal court Friday morning.

He was fired in February for lying to Vice President Mike Pence about his communications with the Russian ambassador.