Special counsel Robert Mueller's investigation appears to be picking up steam, with his team issuing subpoenas in recent weeks for bank records from Paul Manafort, President Trump's former campaign chairman.

Mueller’s investigation team has sent the orders from a Washington grand jury to global banks seeking relevant transaction records and other banking information that involve Manafort, sources familiar with the matter told Bloomberg.

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The subpoenas also reportedly seek information related to some of Manafort's companies as well as his former business partner Rick Gates.

Other business associates, including Manafort’s son-in-law and a Ukrainian oligarch, have been contacted by Mueller's team in an attempt to pressure Manafort into cooperating with prosecutors, one source told Bloomberg.

FBI agents conducted a raid on Manafort's home late last month under a search warrant.

A spokesperson for Manafort confirmed the raid had taken place, adding that he continues to work with law enforcement.

"Mr. Manafort has consistently cooperated with law enforcement and other serious inquiries and did so on this occasion as well," the spokesperson said in a statement Wednesday.

Mueller's team is likely taking a close look at Manafort's business dealings, including his lobbying for a pro-Russian party in Ukraine before he was on the Trump campaign.

Several congressional panels are also investigating Russia's involvement in the 2016 election.