Trump's lead lawyer countering Special Counsel Robert Mueller's Russian Federation probe, Emmet Flood, and White House Chief of Staff John Kelly were also allowed to attend the opening of both briefings, a move Democrats decried as a disturbing breach of protocol.
Flood and White House chief of staff John Kelly attended the start of the briefings before leaving.
The FBI's use of the confidential source has roiled Washington for the past week, as President Donald Trump has repeatedly cast the man as a spy implanted in his campaign for political purposes.
Giuliani said Mueller's office, which has been negotiating the parameters of a potential sit-down, would probably limit questions to those involving whether the campaign colluded with Russian agents and whether Trump tried to obstruct the investigation into those efforts.
Rep. Adam Schiff (D-Calif.), the top Democrat on the House Intelligence committee, said the meeting on the classified information had not changed his view that the FBI followed proper procedures during their investigation.
Also attending the meeting were FBI Director Christopher Wray, Director of National Intelligence Dan Coats and Edward O'Callaghan, a top Justice Department Official. The president intensified his attacks this week, calling it "spygate" and tweeting Thursday that it was "Starting to look like one of the biggest political scandals in USA history".
It continued: "They also conveyed the president's understanding of the need to protect human intelligence services and the importance of communication between the branches of government". All America's intelligence agencies agreed that Russian Federation tried to influence the 2016 election to make Trump president.More news: Reboot routers to stop malware attack
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He began by slamming the media's "predictably dishonest" response, flagging CNN's Don Lemon when he insisted that President Trump "doubled down on his baseless claims" CNN legal analyst Jeffrey Toobin when calling it a "fake issue", and MSNBC analyst David Corn labeling it a "phony baloney story".
Risky time when our country is led by those who will lie about anything, backed by those who will believe anything, based on information from media sources that will say anything.
It's blatant obstruction of justice and interference in an ongoing criminal investigation. The deputy attorney general relented after Trump's demand that the Justice Department comply.
"And at what point do we as Americans say it is not right to spy on a campaign", Meadows told host Margaret Brennan.
As he departed the White House early Wednesday afternoon en route to an event in New York, Trump told reporters: "I hope it's not true, but it looks like it is". Chairman Nunes has requested all documents related to this intelligence source.
Justice Department officials initially invited only Nunes and committee member Gowdy to review the classified information regarding the Federal Bureau of Investigation informant and the agency's purported monitoring of Trump campaign officials.
Trump has been claiming since his early days as president that he was spied upon by President Barack Obama's administration. The secretary for homeland security, Kirstjen Nielsen, having been yelled at during a Cabinet meeting by Trump angry his wall hasn't been built, was so intimidated that she said publicly she was unaware the entire intelligence community agreed the Russians worked illegally to elect Trump.