The Manhattan district attorney’s office is questioning Paul Manafort’s associates as part of a probe into the former Trump campaign chairman's business activities, Bloomberg reported Tuesday.

Cyrus Vance's office has scheduled interviews with as many as 20 of Manafort’s associates and lenders, according to the news outlet.

The group reportedly includes Stephen Calk, the founder of Chicago’s Federal Savings Bank, which has provided about $16 million in loans that benefited Manafort. Investigators have looked into the bank as part of their probe into whether Manafort committed fraud, Bloomberg reported.

Calk served as an economic adviser to the Trump campaign.

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Vance has also issued subpoenas to lenders for documents about Manafort's business dealings, according to Bloomberg.

Vance and New York Attorney General Eric Schneiderman (D) are investigating Manafort's real estate dealings for possible fraud and money laundering.

Manafort and an associate were indicted last month on federal charges stemming from special counsel Robert Mueller’s probe into Russian interference in the 2016 U.S. presidential election.