The response was a highly secretive process that she said was further complicated by Senate Majority Leader Mitch McConnell's refusal to go along with a bipartisan warning about the Russian efforts.
House Republicans close to the president - led by Rep. Devin Nunes of California, the Intelligence Committee chairperson - had been pressing unsuccessfully for weeks for access to material related to the informant, issuing a subpoena and threatening to hold top Justice Department officials in contempt of Congress for refusing to turn it over.
In May 2016, a foreign policy adviser to Donald Trump's campaign told a high-ranking Australian diplomat that Russian Federation had political dirt on Hillary Clinton. More than a year ago, he admitted as much in an interview with Lester Holt, when he said the Russian Federation investigation weighed heavily in his decision to fire FBI Director Jim Comey.
In his tweets, Trump also quoted Andrew Napolitano, a former New Jersey Superior Court judge and frequent Fox News commentator, saying that "it's clear that they had eyes and ears all over the Trump campaign".
The president has suggested otherwise in a storm of tweets, including one on Thursday proclaiming that "SPYGATE could be one of the biggest scandals in history!" "SPYGATE-a awful thing!" Trump tweeted Thursday.
Some House GOPs sought information on a confidential FBI source who, during the investigation into possible campaign ties to a foreign power, spoke with Trump campaign aide Carter Page, Trump campaign co-chairman Sam Clovis and campaign adviser George Papadopoulos, who pleaded guilty to lying to investigators in October and has been cooperating with special counsel investigators. I hope - I mean, if you look at Clapper, he sort of admitted that they had spies in the campaign, yesterday, inadvertently. He said the effort was to protect the USA political system and "protect the campaign". While the Federal Bureau of Investigation disclosed the discovery of Clinton emails on Anthony Weiner's laptop weeks before the election, the only major story on the probe into her rival that leaked last October was a New York Times piece that all but exonerated Donald Trump in its headline.
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The money Trump referenced in his Tuesday night tweets is presumably the more than $1 million the government paid Halper for his services over the years, dating at least back to 2012, which included work for a Pentagon think tank.
But that distinction was largely lost in the Twitter barrage of recent days as Trump unloaded on "the person placed very early into my campaign".
Critics, including top congressional Democrats, argue that Republicans want to use the information to undercut the Russian Federation investigation, which is now being led by Special Counsel Robert Mueller. The probe has produced several criminal convictions of Trump campaign officials.
So that's where we are: President Trump made an obviously false charge, everyone acted as though it might be true, and we went through all this rigamarole only to find out that, yes, it was obviously false.
As for Comey, the FBI director fired by Trump, he has drawn sharp criticism from Democrats for revealing the renewed Clinton email investigation, which ultimately produced no charges.
That explanation has not satisfied many Democrats.
"We need to know why did it begin, who authorized it and what role did Barack Obama have".
Although Trump offered no evidence that the informant's activities were illegal or inappropriate, Deputy Attorney General Rod Rosenstein tried to placate him by asking the DOJ's inspector general, Michael Horowitz, to look into the matter.