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 lawyer Rudy Giuliani suggested on Sunday that former President Obama and his top intelligence officials "knew" the FBI had used a top-secret informant to allegedly spy on Trump's 2016 campaign.

In an interview with radio host John Catsimatidis, Giuliani insisted that former CIA Director John Brennan John Owen BrennanJournalism or partisanship? The media's mistakes of 2016 continue in 2020 Comey on Clinton tweet: 'I regret only being involved in the 2016 election' Ex-CIA Director Brennan questioned for 8 hours in Durham review of Russia probe MORE and former Director of National Intelligence James Clapper James Robert ClapperOn China, Biden is no Nixon — and no Trump The Hill's 12:30 Report - Speculation over Biden's running mate announcement Trump slams former intelligence officials to explain 'reluctance to embrace' agencies MORE were aware of the informant.

Giuliani also suggested that Brennan likely briefed Obama himself on the matter.

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"Brennan and Clapper knew about it. Brennan briefed him every day, Obama — well to the extent that he got briefed every day," Giuliani said. "You would have to have brought this up, wouldn't you? Gosh, I can't see how you would escape it."

Trump and his political allies have raised concerns in recent days that the FBI infiltrated his 2016 presidential campaign for political purposes.

The informant, identified in media reports as American professor Stefan Halper, reportedly met with three Trump campaign advisers — 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 — during the 2016 presidential race.

But no evidence has emerged that the informant was used to spy on the campaign, much less for political purposes.

Clapper and Brennan have pushed back on Trump's claims, insisting that the informant was used to try to determine what role Russia was playing in the 2016 election.

The U.S. intelligence community released an assessment months after the informant met with campaign advisers that revealed Moscow had meddled in the presidential race to ensure Trump's victory.

Giuliani's comments came after select lawmakers met with top Justice Department officials for a pair of highly classified meetings on Thursday to discuss the FBI's use of the informant.