The newly unsealed indictments allege that Mr Manafort attempted to avoid paying taxes on "tens of millions of dollars" in income resulting from their work as consultants for the Ukrainian government, former Ukrainian President Victor Yanukovych, as well as Ukrainian political parties.
"Manafort and Gates fraudulently secured more than twenty million dollars in loans by falsely inflating Manafort's and his company's income and by failing to disclose existing debt in order to qualify for the loans", the indictment says.
In its court filing Thursday, the special counsel's office said it brought the new charges before the grand jury in the Eastern District of Virginia because "our current evidence venue for these charges does not exist in the district of Columbia".
Mueller is tasked with investigating Russian meddling in the 2016 election and the possibility that associates of President Trump colluded with the Kremlin.
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Numerous details in the new indictment are shared with those in the October indictment, including the usage of offshore accounts.
Both men pleaded not guilty after they were initially charged in October. It leaves open the possibility that Manafort or Gates could face additional state charges of filing false tax returns.
Appeared in the February 22, 2018, print edition as 'Mueller Examines Manafort Loans'. Those charges are also connected to the offshore accounts in the new indictment.
The new indictment comes just a day after Alex Van Der Zwaan, a Dutch lawyer and son-in-law of a Russian oligarch, pleaded guilty to lying to investigators about communications regarding Ukraine with Gates.
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There is now little known about the nature of the new filing.
They pleaded not guilty to charges brought against them by Mr Mueller past year.
But they can only make a deal if they have valuable information that Mueller can use in other prosecutions.
Donald Trump senior campaign adviser Paul Manafort (L) at reception with former candidate Dr Ben Carson (C) Republican National Committee spring meeting, Diplomat Resort, Hollywood, Florida, April 21, 2016.
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