Fox News's Andrew Napolitano said late Tuesday there is “no evidence” to support President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE’s “spygate” claim that the FBI planted spies in his 2016 presidential campaign.

Napolitano, the news network's senior judicial analyst, said on "The Story With Martha MacCallum" that Trump’s lawyer, Rudy Giuliani, is making a “baseless” claim.

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“The allegations by Mayor Giuliani over the weekend, which would lead to us believe that the Trump people think that the FBI had an undercover agent who inveigled his way into the campaign and was there as a spy on the campaign, seem to be baseless,” Napolitano said.

There is no evidence for that whatsoever, he added.

Giuliani suggested on Sunday that former President Obama and his top intelligence officials were aware that the FBI had used a top-secret informant to allegedly spy on Trump’s campaign.

The FBI did use an informant, identified in media reports as American professor Stefan Halper, who met with three Trump campaign advisers in 2016: George PapadopoulosGeorge Demetrios PapadopoulosTale of two FBI cases: Clinton got warned, Trump got investigated Trump says he would consider pardons for those implicated in Mueller investigation New FBI document confirms the Trump campaign was investigated without justification MORE, Carter Page and Sam Clovis.

No evidence has emerged, however, that the informant was used to spy on the campaign for political purposes.

Napolitano said Tuesday that the use of an informant is “standard operating procedure” in intelligence gathering and during criminal investigations.