Sam Patten, the former associate of 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 who pleaded guilty on Friday to illegal foreign lobbying, sought tickets to 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 inauguration for a prominent Ukrainian oligarch, according to U.S. prosecutors.

According to the statement of the offense, Patten tried to conceal the source of a $50,000 payment for four presidential inauguration tickets in 2017 on behalf of the Ukrainian oligarch, who is not named. The Presidential Inauguration Committee does not accept money from foreign nationals, but allows foreigners to attend the inauguration so long as they do not pay for the tickets.

Prosecutors say that Patten “solicited a United States citizen to act as a ‘straw’ purchaser” in order to conceal the source of the money for the tickets. The individual paid $50,000 for the tickets, after receiving the same sum from a company controlled by Patten and an unnamed Russian national. The oligarch had paid the sum to Patten’s firm through a Cypriot account.

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Prosecutors also say Patten misled the Senate Intelligence Committee during testimony in January by withholding documents concerning the payments from the committee and by giving false and misleading testimony.

Patten pleaded guilty to violating the Foreign Agents Registration Act, a federal law governing foreign lobbying, in federal court in Washington, D.C., on Friday. The charge stems from his work lobbying on behalf of a political party in Ukraine known as the Opposition Bloc and the Ukrainian oligarch between 2014 and 2018.

Patten is a former associate of Manafort, Trump's former campaign chairman who was recently convicted on eight counts of bank and tax fraud in a case stemming from 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's investigation into Russian interference in the 2016 presidential election. Manafort faces a separate trial in D.C. on charges of conspiracy to launder money and failing to register as a foreign agent in late September.

Patten's case was referred by Mueller to prosecutors in the U.S. attorney's office in D.C. The plea agreement suggests that he is cooperating with the special counsel's office, though the extent or nature of that cooperation remains unclear.

Patten is not being charged for the actions related to the inaugural tickets.

-- Updated 2:57 p.m.