A spokesman for President Trump's former campaign manager Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE is set to testify before a federal grand jury in Washington on Friday, Politico reported.

Jason Maloni was hired by Manafort earlier this year. The move came after Manafort came under increased scrutiny for his possible ties to Russia and his lobbying work overseas.

Manafort, who was fired from Trump's campaign last summer, has emerged as a key figure in special counsel Robert's Mueller's investigation into Russia's efforts to meddle in the 2016 election.

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Prosecutors are looking into Manafort's business and real estate transactions for possible money laundering.

Manafort has not been charged with any crimes.

That a spokesperson has been called to testify before a grand jury is unusual, according to Politico, because of their confidential relationships with clients and access to wide-ranging information.

Mueller's investigation has appeared to accelerate in recent months, and Manafort has become the target of increasingly aggressive action by the special counsel. In July, the FBI conducted an early-morning raid on Manafort's Alexandria, Va., home.

CNN reported late last month that Mueller had subpoenaed Maloni, as well as Manafort's former lawyer Melissa Laurenza.