He demanded in recent days that the Justice Department investigate the matter and turn over records to Congress, ignoring warnings from law enforcement officials in his administration, that sharing the documents would put the informant and foreign intelligence partners at risk.
Democrats have expressed concerns that Republicans' demands are animated by a desire to undermine the work of Special Counsel Robert Mueller - or else to directly inform the President's legal strategy.
Former FBI Director James Comey, who was sacked by Trump past year, tweeted Wednesday morning that the agency's use of secret informants was "tightly regulated and essential to protecting the country".
Under direct pressure from the president, Justice Department officials agreed to grant Republicans a briefing, and only later opened it up to Democrats. "The whole thing is already a waste of money".
He added that he does not expect Trump to fire Mueller, Attorney General Jeff Sessions, or Deputy Attorney General Rod Rosenstein, and that he believes Trump's tweets have been "effective" at turning public opinion against Mueller's probe.
Trump ran with the quote, using it to bolster his argument he was spied on by the Obama administration.
"What motivated putting him in?"
"The President tweeted Wednesday morning, "'Trump should be happy that the Federal Bureau of Investigation was SPYING on his campaign' No, James Clapper, I am not happy.
Senate Democratic leader Chuck Schumer and House Democratic leader Nancy Pelosi are asking the Justice Department to cancel a rare classified briefing for two House Republicans, saying it's "highly irregular and inappropriate".
Senator Mark Warner, the top Democrat on the Intelligence Committee, said "there's never been a Gang of 8 meeting with a White House presence".
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"He's not the subject or target of that investigation".
The former NY mayor said he was handling much of the public-facing role for Trump's legal team, while Jane and Martin Raskin - two new Florida lawyers on the team - are reviewing facts and interacting with Mueller's office.
It is unclear whether the Republicans who attended were satisfied with the briefings' outcome. "After making their brief comments they departed before the meetings officially started". The person declined to be identified because the briefing was classified.
On Wednesday, Trump tweeted that the FBI's use of a government informant amounts to "one of the biggest political scandals in history".
It remains unclear what, if any, spying was done.
House Intelligence Committee Chairman Devin Nunes, an ardent Trump supporter, had originally requested the information on an FBI source in the Russian Federation investigation.
Special Counsel Robert Mueller departs after a closed-door meeting with members of the Senate Judiciary Committee about Russian meddling in the election and possible connection to the Trump campaign, at the Capitol in Washington, June 21, 2017.
In addition, Giuliani also said a decision would be made on a Mueller interview by June 12.
Former Director of National Intelligence James Clapper said Wednesday that President Donald Trump had distorted his words when alleging the intelligence community "spied" on his campaign. He says, "We are working to make that happen".
Associated Press writer Mary Clare Jalonick contributed reporting.