Fox News host Shepard Smith on Wednesday defended his colleague Judge 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 over his assessment 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 a crime by asking the leader of Ukraine 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 Biden's son.

The anchor offered an impassioned defense of the Fox News legal analyst on his daily program while denouncing a network guest who called Napolitano a "fool" over his comments about the president the previous night.

"Last night on this network, a partisan guest who supports President Trump was asked about Judge Napolitano’s legal assessment. And when he was asked, he said, unchallenged, Judge Napolitano is a fool," Smith said, referring to remarks conservative commentator and former federal prosecutor Joseph diGenova made on "Tucker Carlson Tucker CarlsonJudge tosses Karen McDougal's defamation suit against Tucker Carlson OVERNIGHT ENERGY: House passes sweeping clean energy bill | Pebble Mine CEO resigns over secretly recorded comments about government officials | Corporations roll out climate goals amid growing pressure to deliver Former Florida attorney general calls Kyle Rittenhouse 'a little boy out there trying to protect his community' MORE Tonight." "Attacking our colleague, who’s here to offer legal assessments on our air, in our work home, is repugnant."

Fox's Shep Smith slams Joe Digenova who appeared on Tucker last night and said Andrew Napolitano was a "fool" for saying Trump trading aid for dirt on Biden was a crime. Shep said the comment was "repugnant" and cited other legal experts who backed up Napolitano. pic.twitter.com/ZRzEpT1ha1 — Oliver Willis (@owillis) September 25, 2019

Smith, who hasn't been shy about voicing criticism of the president, went on to cite a cadre of legal experts who share Napolitano's views. The opinions came from a range of criminal defense attorneys and prosecutors who Smith says told him that Trump's request likely violated campaign finance law.

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For example, Smith said that Alex Little, a former assistant U.S. attorney in the Justice Department, told him that Trump's solicitation "likely violates the election law prohibitions on seeking foreign assistance from foreign governments."

The comments came as Trump faces escalating pressure regarding his interactions with Volodymyr Zelensky that are at least part of a whistleblower complaint that first gained attention last week.

The president in a July 25 phone call urged Zelensky to work with his personal attorney Rudy Giuliani Rudy GiulianiThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting CIA found Putin 'probably directing' campaign against Biden: report Democrats fear Russia interference could spoil bid to retake Senate MORE and Attorney General William Barr Bill BarrFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Why a backdoor to encrypted data is detrimental to cybersecurity and data integrity FBI official who worked with Mueller raised doubts about Russia investigation MORE to investigate the Bidens, according to a memo of the conversation released by the White House.

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The call occurred around the same time the Trump administration delayed millions of dollars in aid to Ukraine, raising speculation as to whether Trump used the aid as leverage in their talks. Trump has denied addressing military aid in their discussions.

Before the memo's release, Napolitano had said that Trump had already confessed to impropriety by acknowledging that he'd asked the Ukrainian leader to look into Biden and that "it is a crime for the president to solicit aid for his campaign from a foreign government."

Appearing on Fox Business on Monday, Napolitano also warned that the current charges against Trump are more serious than what former 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 found.

"If true — we haven’t seen the whistleblower complaint, and, under the law, it has to be revealed — if true, this is an act of corruption," he said.