Former Trump 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’s deal agreeing to cooperate with 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 poses a new danger to President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE and his inner circle by providing prosecutors with additional inside information they previously would not have had, legal experts reacting to the news told The Hill.

Even voices that have been deeply critical of Mueller’s actions said it is definitely a big win for the special counsel to have secured cooperation from Manafort, though they cautioned that is remains unclear exactly what Manafort has.

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“Potentially, [Manafort's guilty plea] opens up lots of doors that probably haven't been opened before,” Harvard law professor Alan Dershowitz, who has frequently defended Trump over Mueller’s probe, said during a Friday appearance on MSNBC.



“I think from the point of view of Mueller, this is a big win, this is a big gain because he gets access to somebody,” added Dershowitz, who is a contributor to The Hill.

Manafort pleaded guilty to two charges on Friday as part of his deal.

The White House and Trump’s attorneys have asserted that Manafort’s convictions and guilty plea have nothing to do with the president or his 2016 bid; Trump himself has tweeted that Manafort worked for him for only a short period of time.



Trump’s lawyer Rudy Giuliani told The Hill that if Manafort had incriminating evidence on Trump, Mueller’s team “would have had him plead to a conspiracy that would encompass the president.”



Still, Manafort’s cooperation agreement with Mueller means that he will interview with the special counsel, testify in any upcoming cases and hand over documents related to the investigation, putting a new body of evidence at Mueller’s disposal.



Manafort also waived his right to have an attorney present at any interviews with federal investigators, and the deal itself makes no mention of the Trump campaign — meaning the topic is on the table for those interviews.



“[The implications for Trump] could be huge,” said former federal prosecutor Elie Honig, regarding Manafort’s deal with Mueller.



While he only led the Trump campaign for three months, Manafort did so during a period of time that has come under heavy scrutiny by Mueller: He was one of several Trump campaign officials at a July 2016 Trump Tower meeting with a Russian lawyer, who was offering political dirt on Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE.



The president confirmed in a tweet earlier this year that his son, Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE, agreed to the meeting to try to obtain damaging information on his political rival. Manafort also attended the meeting, as did White House aide Jared Kushner Jared Corey KushnerAbraham Accords: New hope for peace in Middle East Tenants in Kushner building file lawsuit alleging dangerous living conditions Trump hosts Israel, UAE, Bahrain for historic signing MORE, Trump’s son-in-law.

Honig said that if he were asking Manafort questions, he would immediately focus on the Trump Tower meeting.



“I’d have a million questions,” he said, “and the people who could get hurt by his answers, I think, run the gambit from Donald Trump to Trump Jr. to Kushner, on down the line.”



Jonathan Turley, a legal expert and law professor at the George Washington University, said that while he doesn’t believe Manafort’s agreement with Mueller puts Trump directly in danger, it could implicate figures such as Kushner and Trump Jr.



Kushner and Trump Jr. have interviewed with congressional investigators about the meeting, which has come under intense scrutiny since it was first publicly revealed by The New York Times last year.



Turley, a contributor for The Hill, said that Trump — who has been protective of his family — could “destroy himself by his own hand” if he reacted impulsively to the indictment of someone like Kushner or Trump Jr., and could even trigger impeachment proceedings.



“An effort to go after a collateral figure like Kusher or Donald Trump Jr. could set in motion a series of cascading events that could well endanger the presidency,” Turley said. “But those events would largely occur because of the response of President Trump to any indictment of a close aide or family member.”



The law professor also said that Trump’s team is likely concerned that the special counsel now has another cooperating witness on its side, saying that any information provided by Manafort could be placed alongside that offered by any of the other witnesses, like former national security adviser Michael Flynn, to further the investigation.



But Turley noted that the plea deal meant the Trump administration would be spared from the negative news cycles stemming from Manafort’s Washington, D.C., trial, which would have taken place blocks from the White House.



Former federal prosecutor Kendall Coffey said that federal prosecutors wouldn’t have offered a deal to Manafort, a high-profile target, unless they believed he could provide them with valuable assistance.



“And you know that every detail of anything and everything the Manafort heard in respect to the Trump campaign is being carefully drawn out and examined by the government,” Coffey said. “They may not have anything, but Manafort cannot hold anything back if there’s to be a hope of providing substantial assistance” as part of the agreement.



Coffey also highlighted Manafort’s attendance at the Trump Tower meeting as a likely line of questioning for federal prosecutors. Mueller’s team has reportedly flagged the meeting as an area of interest in their special counsel probe.



“If there was any wrongdoing whatsoever in connection to the Trump Tower meeting, whether it’s circumstances surrounding the meeting itself or statements given after the fact about the meeting — any wrongdoing whatsoever is under a microscope right now,” he said. “And Manafort would be an important witness.”



Former U.S. Attorney Barbara McQuade said that Trump is likely concerned his former campaign head is now talking to investigators who are focused on his campaign and possible collusion with Russia.



She said Manafort will be able to provide Mueller with a first-hand account of the Trump Tower meeting, as well as insider information on the inner workings of the Trump campaign.

McQuade added that whatever information Manafort provides to investigators will be fully verified, and that the entire deal could be scrapped if the businessman is found to have lied.



“Soon, Robert Mueller will know whatever Paul Manafort knows,” McQuade said.