Fox News anchor Shepard Smith hit back at Former U.S. Attorney Joe diGenova after he appeared on Fox Tuesday night and called Judge Andrew Napolitano “a fool.”

“Last night on this network during primetime opinion programming, 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.’ Attacking our colleague who is here to offer legal assessments on our air in our work home is repugnant,” Smith said on his afternoon show Wednesday.

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On Smith’s show Tuesday, Napolitano, Fox’s Senior Judicial Analyst, said it is a crime for a president to solicit aid for his campaign from a foreign government during a discussion of President Donald Trump’s communication with the Ukrainian president.