Fox New’s Judge Andrew Napolitano warned Monday that Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE's firing on Friday of former deputy FBI director Andrew McCabe Andrew George McCabeGraham: Comey to testify about FBI's Russia probe, Mueller declined invitation Barr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' GOP votes to authorize subpoenas, depositions in Obama-era probe MORE could be seen as “obstruction of justice.”

Napolitano said on Fox News's "America's Newsroom" Monday that he viewed McCabe’s firing as “vindictive” and “reckless.”

“Andrew McCabe is more likely than not to be a witness against the attorney general’s boss, the president of the United States,” Napolitano said. “I think that firing him in that environment could very well be determined to diminish his effectiveness as a witness. What’s that called? Obstruction of justice.”

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“I don’t know if Bob Mueller wants to go there, but that’s the argument,” he added, referring to 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.

Sessions fired McCabe on Friday night, saying that the former FBI official had made an unauthorized disclosure to the media and wasn’t fully forthcoming with investigators.

McCabe said he was fired as part of an effort to undermine Mueller’s probe into Russia's election interference, in which he is likely to be a witness.

McCabe led the FBI in the weeks after President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE’s firing of former FBI Director James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE, a reported area of interest in Mueller’s probe.

Napolitano also blasted Trump’s lawyer John Dowd for saying in a statement that he wanted Mueller's probe to be shut down.

“Going on television, saying, ‘I pray that you shut down shop,’ is not the way a lawyer for an innocent defendant conveys the message on TV,” Napolitano said.

Dowd initially told The Daily Beast that he was making the statement on Mueller’s probe on behalf of the president, but later walked back the remark.

Trump once described Napolitano as a “very talented legal mind.”