…Investigators were reportedly concerned that the intelligence included communications that Manafort may have encouraged the Russians to help influence the 2016 election, though two unnamed sources familiar with the matter cautioned that the evidence is not conclusive.

Manafort has emerged as a key figure in special counsel Robert Mueller’s investigation into Russia’s role in the 2016 election and possible collusion between the Trump campaign and Moscow.

Mueller’s team has taken a series of aggressive actions against Manafort in recent months. In July, for example, the FBI conducted an early-morning raid of Manafort’s Alexandria, Va., home. Mueller has also subpoenaed the former campaign chairman’s personal spokesman and former attorney…