President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE's campaign chairman, 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, earned more than $60 million working for Russia-backed Ukraine politicians, special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE said in a new court filing Monday.

Mueller said government prosecutors expect to prove that Manafort earned the money and failed to report a significant percentage of it on his tax returns. The filing is the first time a tally of Manafort's earnings in Ukraine has been revealed.

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“No ‘pay stubs’ or ‘paychecks’ reflect that income, rather, the invoices and bills submitted by various consultants provide proof on that issue,” he said in the filing.

“Accordingly, to prove that Manafort earned that much income, the government must be able to show the extent of the work that he performed for Ukraine.”

Mueller is fighting Manafort’s request for the court to exclude more than 50 trial exhibits that relate to his political consulting work in Ukraine between 2005 and 2014.

Mueller said the challenged exhibits, which include a memoranda, emails and photos reflecting tasks performed, are relevant to establish the extent of Manafort’s work.

The filing comes a day before Manafort’s trial on bank and tax fraud charges is set to begin this week.