Judge Andrew Napolitano has reportedly been sidelined by the news channel following his unproven assertion that British spies assisted Mr Obama in eavesdropping on Mr Trump.
Napolitano, a Fox News analyst, is not scheduled to appear on the network in the near future, the Los Angeles Times reported, according to people familiar with the situation. White House press secretary Sean Spicer said Manafort, who led Trump's successful 2016 bid for the Republican presidential nomination "played a very limited role for a very limited amount of time".
Napolitano, a former New Jersey Superior Court Judge and visiting professor at Brooklyn Law School, joined Fox Radio in 2006 and later became a fixture on Fox News, where he frequently provides legal analysis.
"By bypassing all American intelligence services, Obama would have had access to what he wanted with no Obama administration fingerprints", Napolitano wrote in a column on FoxNews.com.
In response, GCHQ, usually silent on intelligence matters, sharply denied that it had engaged in any of the activities described by Napolitano.
"Recent allegations made by media commentator Judge Andrew Napolitano about GCHQ being asked to conduct "wire tapping" against the then President Elect are nonsense", said a spokesman for the agency, which rarely comments publicly on its operations. The British spy agency sharply denounced Napolitano's allegations, saying they are "utterly ridiculous and should be ignored".
For the most part, aides have declined to confirm that Trump was playing golf on weekends in Florida, instead repeatedly telling reporters that the President "may" hit a few balls at his course but that they didn't know for sure. I didn't make an opinion on it. "That was a statement made by a very talented lawyer on Fox". "How you use the game of golf is something he's talked about".
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".
Rather than issue explicit corrections about Napolitano's reports, the network aired a series of brief updates on Friday, with news anchors saying things like "Fox News can not confirm Judge Napolitano's commentary". "Full stop", Shepard said on air.