Former Attorney General Eric Holder Eric Himpton HolderThe Hill's Campaign Report: Trump's rally risk | Biden ramps up legal team | Biden hits Trump over climate policy Biden campaign forming 'special litigation' team ahead of possible voting battle Pompeo, Engel poised for battle in contempt proceedings MORE said Wednesday that a "technical" case for obstruction of justice charges could be made against President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE, but cautioned that he didn't know if enough evidence existed to bring a case against the president.

In an interview with MSNBC's Rachel Maddow, the Obama-era attorney general pointed to Trump's decision to fire former FBI Director James Comey James Brien ComeyBook: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa Graham: Comey to testify about FBI's Russia probe, Mueller declined invitation MORE, as well as other actions the president had taken, as an impetus for a possible case.

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"You're talking about a technical case as opposed to one you might bring now," Holder said.

"If one looks at the dismissal of James Comey and the reasons why the president told Lester Holt he did that, if you look at the president's attempts to try to get people who were the heads of the intelligence agencies to get involved in this matter, if you look at the president's actions on the airplane with regards to that statement, and a variety of other things, I think you technically have a case of obstruction of justice."

But Holder went on to caution that 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 may not be ready or able to bring such a case to a court yet.

"I'm not saying that this is a case that you would necessarily bring at this point, and I don't know what other evidence the special counsel has, but I think just from the basis of what has been reported in the media, and assuming that those reports are accurate, I do think that you have a technical case of obstruction of justice," he added.

Holder's comments about the president's alleged lawbreaking are some of the sharpest criticism of Trump yet from former members of the Obama administration. Holder served as Obama's attorney general from 2009-2015.

Mueller's special counsel investigation has ensnared four people connected to the Trump campaign or administration, including former national security adviser Michael Flynn, former Trump campaign chair 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 and his business associate Richard Gates, and former Trump campaign foreign policy aide George PapadopoulosGeorge Demetrios PapadopoulosTale of two FBI cases: Clinton got warned, Trump got investigated Trump says he would consider pardons for those implicated in Mueller investigation New FBI document confirms the Trump campaign was investigated without justification MORE.

Mueller is reportedly interested in questioning the president about his decision to fire Comey last year, as well as his interactions with Flynn, who pleaded guilty to lying to investigators last year.