Fox News legal analyst Andrew Napolitano Andrew Peter NapolitanoFox's Napolitano says grand jury erred in Taylor case: 'I would have indicted all three of them' Fox's Napolitano: Supreme Court confirmation hearings will be 'World War III of political battles' Fox's Napolitano: 2000 election will look like 'child's play' compared to 2020 legal battles MORE is arguing that President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE committed an impeachable offense during a July 25 phone call in which he pressured the Ukrainian president to investigate 2020 presidential candidate Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE and his son.

"That conversation manifested both criminal and impeachable behavior," Napolitano writes in a Fox News column focused on a whistleblower complaint that accuses Trump of enlisting Ukraine's help in his 2020 reelection efforts.

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Napolitano goes on to assert that "the criminal behavior to which Trump has admitted is much more grave than anything alleged or unearthed by 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."

The column is accompanied by a web video in which Napolitano summarizes the revelations from a White House memorandum of Trump's conversation with Ukrainian President Volodymyr Zelensky. The White House issued the memo just a day before the public disclosure of the intelligence community whistleblower complaint.

Napolitano zeroes in on a portion of the White House readout in which Trump asks for a "favor" from Zelensky after the Ukrainian leader talks about the prospect of buying U.S. anti-tank missiles.

Trump's request occurred around the same time that the U.S. delayed nearly $400 million in military aid to Ukraine, raising speculation from many Democratic lawmakers as to whether the president was looking to use the aid as leverage in the talks.

"He held up that aid and instead asked for a favor, which arguably was for his political campaign," Napolitano says. "That was a violation of federal law. That is an impeachable offense."

Trump has denied holding up military aid to Ukraine as part of an effort to persuade the nation into investigating the Biden family. But Napolitano asserts that Trump's request for a "favor" is evidence of a quid pro quo.

"In the Zelensky phone call, he told the Ukrainian president that he needed a personal 'favor,' " Napolitano writes in the column. "The clear unmistakable inference is that the $391 million in aid would be held up until the favor was delivered. The favor he sought was dirt on Biden."

The former New Jersey Superior Court judge's remarks come as Trump faces escalating scrutiny regarding his efforts to get a foreign nation to find dirt on a top political opponent. The revelations prompted Speaker Nancy Pelosi Nancy PelosiDemocratic senator to party: 'A little message discipline wouldn't kill us' Overnight Health Care: New wave of COVID-19 cases builds in US | Florida to lift all coronavirus restrictions on restaurants, bars | Trump stirs questions with 0 drug coupon plan Overnight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds MORE (D-Calif.) to announce a formal impeachment inquiry of Trump in the House.

Before the memo's release, Napolitano had said that Trump had already confessed to "a crime" by acknowledging that he'd asked the Ukrainian leader to look into Biden.

Trump has repeatedly defended his interactions with Zelensky, going so far as to call the July 25 phone call "perfect." He's also decried the impeachment inquiry as a "coup" and accused the whistleblower of being a spy.