Former Trump campaign chairman Paul Manafort is reportedly under scrutiny after federal law enforcement officials identified more than $40 million in "suspicious transactions" to and from companies he controlled.

The $40 million is higher than the amount included in Manafort's indictment last year on money laundering charges, BuzzFeed News reported.

According to news outlet, the $40 million in suspicious transactions were unearthed in 2014 and 2015 during an FBI effort regarding international kleptocracy.

The issue was then resurrected by special counsel Robert Mueller's team.

Last week, Mueller's team said in a court filing it learned of "additional criminal conduct" claims against Manafort, including "a series of bank frauds and bank fraud conspiracies" relating to a mortgage on Manafort's property in Fairfax, Va.

The new criminal accusations came in response to a request from Manafort to reconsider the conditions of his bail. Mueller rejected Manafort's proposed bail package in part over the new criminal conduct claims.

Investigators said they learned of the alleged fraud after the bail deal's terms were set, according to court documents. Manafort was pushing for a new bail package over his indictments for past foreign consulting work.