President Trump's former campaign chairman Paul Manafort pleaded guilty Friday to new charges brought forth by the special counsel, and entered into a "cooperation agreement" with the Justice Department.

The big picture: In the new charges, Manafort was accused of disseminating false stories on behalf of his pro-Russia, Ukrainian client and not disclosing his lobbying efforts to the Justice Department as required by law. He was also found guilty last month on eight counts of bank and tax fraud.

What we don't know: What kind of information Manafort has to provide Mueller — or who he'll offer up dirt on.

Key takeaways from the filing of new allegations, as outlined by the New York Times' Kenneth Vogel: