Paul Manafort pleaded guilty on Friday to two counts of conspiracy and obstruction in the Russia investigation.

Andrew Weissman, a prosecutor on the special counsel Robert Mueller's team, said Manafort's plea deal included an agreement to cooperate with Mueller in the investigation.

Paul Manafort pleaded guilty on Friday to one count of conspiracy to obstruct justice and one count of conspiracy against the US.

Andrew Weissman, a prosecutor on the special counsel Robert Mueller's team, told US District Judge Amy Berman Jackson that Manafort's plea deal included an agreement to cooperate with Mueller in his investigation into Russia's interference in the 2016 election and whether members of President Donald Trump's campaign colluded with Moscow to tilt the race in his favor.

Manafort, the former chairman of Trump's campaign, was the subject of two indictments from Mueller's office. Last month, after his first trial in Virginia, Manafort was convicted on eight of 18 counts related to tax and bank fraud. The judge declared a mistrial on the other 10 counts after 11 jurors voted to convict him and one held out.

The second indictment, brought in Washington, DC, charged him with conspiracy, obstruction, money laundering, false statements, and illegal lobbying.

During Manafort's plea hearing on Friday, Jackson dismissed the remaining 10 counts from the Virginia indictment.

Confirmation of Manafort's impending guilty plea emerged Friday morning when prosecutors filed a criminal information — a type of charging document prosecutors use after striking a plea deal with a defendant to detail allegations of criminal activity — against the former Trump campaign chairman.

Both indictments center on Manafort's political consulting work from 2006 to 2015 for pro-Russian interests like Ukraine's Party of Regions and former Ukrainian President Viktor Yanukovych.

In the Washington, DC, case, prosecutors alleged that Manafort did not register as a foreign agent while lobbying on behalf of Yanukovych and the Party of Regions. They also accused him of making misleading statements about his overseas work, conspiring to launder money, and attempting to tamper with witness testimony.

Rudy Giuliani, Trump's lead defense attorney, told Politico earlier this week that members of the president's legal team were not concerned about the possibility of a plea deal in Manafort's case because they were convinced he wouldn't say anything damaging about Trump.

He did not immediately respond to a request for comment regarding Manafort's cooperation deal.

The White House press secretary, Sarah Huckabee Sanders, said Manafort's case "had absolutely nothing to do with the president or his victorious 2016 presidential campaign."

"It is totally unrelated," she said.

But Manafort is a significant figure in several threads of the Russia investigation. He led the Trump campaign from March to August 2016, during one of the most pivotal periods in the election season.

During that time, he exchanged emails with a former Russian intelligence operative, Konstantin Kilimnik, offering the Russian oligarch Oleg Deripaska "private briefings" about the campaign in what might have been an attempt to resolve a long-standing financial dispute with Deripaska.

He spearheaded the campaign when WikiLeaks published thousands of emails that Russia had stolen from the Democratic National Committee. He was also one of three top campaign officials who attended a June 2016 meeting at Trump Tower with two Russian lobbyists offering dirt on Hillary Clinton described as part of the Russian government's support for Trump's candidacy.