"Fox News can not confirm Judge Napolitano's commentary", Smith said afterward.
On Monday, Napolitano was absent during the network's coverage of the confirmation hearings for Supreme Court nominee Neil Gorsuch.
Fox News anchor Shepard Smith said on Friday that the network had "no evidence" that President Donald Trump was wiretapped during the election.
"President Trump first tweeted that Obama ordered his "'wires tapped' in Trump Tower just before the victory" on March 4.More news: Supreme Court nomination hearing for Neil Gorsuch gets started
Last week, Napolitano made the claims about the Government Communications Headquarters (GCHQ) spying on Trump at former President Barack ObamaBarack ObamaFox News pulls Napolitano after his Trump wiretap claims 9/11 victims suing Saudi Arabia: report THE MEMO: Five takeaways from Comey's big day MORE's behest. The British spy agency sharply denounced Napolitano's allegations, saying they are "utterly ridiculous and should be ignored".
Spicer quoted Napolitano's report, "three intelligence sources informed Fox News President Obama went outside the chain of command, he didn't use the NSA, CIA, FBI and he didn't use the department of justice".
But Napolitano said on one program that "Fox News has spoken to intelligence community members who believe that surveillance did occur, that it was done by British intelligence".
Bret Baier followed suit shortly after, stating, "We love the judge, we love him here at Fox, but the Fox News division was never able to back up those claims and was never reported on this show". Fox News did not respond to requests for comment from the Los Angeles Times.