The president's personal lawyer, former New York City Mayor Rudy Giuliani, has argued, however, that a plea agreement between Manafort and the special counsel does not affect Trump because his former campaign chairman has nothing compromising to say about the president.
The plea, and cooperation, were an abrupt change for Manafort, who was convicted last month in the Virginia federal court on bank and tax fraud charges.
Or Mueller may be directly interested in what Manafort, who led the Trump campaign from April through August 2016, can describe about the campaign's interactions with Russians.
Manafort has been holed up in jail pending his second trial after Berman revoked his $10 million bond earlier this summer.
According to that report, Trump had initially picked former New Jersey Gov. Chris Christie (R) as his running mate, but Manafort "had another idea in mind".
This is a breaking news story and will be updated. Gates pleaded guilty in February to helping Manafort use bank accounts in Cyprus and Grenadines to hide millions they had made while lobbying for Ukrainian politicians. The two conspiracy counts he pleaded guilty to on Friday (Saturday NZT) carry up to five years in prison, though Manafort's sentence will ultimately depend on his cooperation.
She told him, "You are agreeing to cooperate fully and truthfully" with the special counsel's office.
Those were among the first charges stemming from Mueller's investigation into alleged Russian meddling in the 2016 presidential election.
Manafort was facing a second trial set to begin on Monday on charges related to Ukrainian political consulting work, including failing to register as a foreign agent.
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It has been rumored that Trump would grant him a presidential pardon for his crimes.
Besides that, prosecutors extracted a guilty plea, a cooperation agreement from Manafort to tell them everything he knows and fork over any documents they request, an admission of guilt to the 10 remaining charges from the Eastern Virginia trial, and likely a multiyear prison sentence for Manafort.
Manafort is still taking a financial hit, forfeiting $45m of criminal assets.
At the end of the segment, Dershowitz said that a pardon for Manafort is "off the table".
In addition to the witness tampering counts, Manafort had been formally charged with acting as an unregistered foreign agent, conspiring to launder money and lying to the Federal Bureau of Investigation and Justice Department about the nature of his work.
Prosecutors had accused him of hiding from USA tax authorities $US16 million ($22 million) he earned as a political consultant in Ukraine to fund an opulent lifestyle and then lying to banks to secure $US20 million ($29 million) in loans.
As with the Virginia case, the trial in Washington focused on criminal charges that largely predated Manafort's time with Trump's 2016 presidential campaign. Or Trump could be to fire both Attorney General Jeff Sessions and Deputy Attorney General Rod Rosenstein, which would give him the ability to instruct the Justice Department to terminate the Mueller investigation immediately.
Special Counsel Robert Mueller on Friday finally squeezed all the resistance out of Paul Manafort.
Moscow rejects the conclusions of US intelligence agencies that it interfered in the American democratic process and Trump denies campaign collusion. But those were only some of the charges against him.