It also reflected the suspicion among many in the Obama White House that the Trump campaign might have colluded with Russia on election email hacks — a suspicion that American officials say has not been confirmed. Former senior Obama administration officials said that none of the efforts were directed by Mr. Obama.
Sean Spicer, the White House spokesman, said, “The only new piece of information that has come to light is that political appointees in the Obama administration have sought to create a false narrative to make an excuse for their own defeat in the election.”
He added, “There continues to be no there, there.”
As Inauguration Day approached, Obama White House officials grew convinced that the intelligence was damning and that they needed to ensure that as many people as possible inside government could see it, even if people without security clearances could not. Some officials began asking specific questions at intelligence briefings, knowing the answers would be archived and could be easily unearthed by investigators — including the Senate Intelligence Committee, which in early January announced an inquiry into Russian efforts to influence the election.
At intelligence agencies, there was a push to process as much raw intelligence as possible into analyses, and to keep the reports at a relatively low level of classification to ensure as wide a readership as possible across the government — and, in some cases, among European allies. This allowed the upload of as much intelligence as possible to Intellipedia, a secret wiki used by American intelligence analysts to share information.
There was also an effort to pass reports and other sensitive materials to Congress. In one instance, the State Department sent a cache of documents marked “secret” to Senator Benjamin Cardin of Maryland days before the Jan. 20 inauguration. The documents, detailing Russian efforts to intervene in elections worldwide, were sent in response to a request from Mr. Cardin, the top Democrat on the Foreign Relations Committee.
“This situation was serious, as is evident by President Obama’s call for a review — and as is evident by the United States response,” said Eric Schultz, a spokesman for Mr. Obama. “When the intelligence community does that type of comprehensive review, it is standard practice that a significant amount of information would be compiled and documented.”
The opposite happened with the most sensitive intelligence, including the names of sources and the identities of foreigners who were regularly monitored. Officials tightened the already small number of people who could access that information. They knew the information could not be kept from the new president or his top advisers, but wanted to narrow the number of people who might see the information, officials said.
More than a half-dozen current and former officials described various aspects of the effort to preserve and distribute the intelligence, and some said they were speaking to draw attention to the material and ensure proper investigation by Congress. All spoke on the condition of anonymity because they were discussing classified information, nearly all of which remains secret, making an independent public assessment of the competing Obama and Trump administration claims impossible.
The F.B.I. is conducting a wide-ranging counterintelligence investigation into Russia’s meddling in the election, and is examining alleged links between Mr. Trump’s associates and the Russian government.
Separately, the House and Senate intelligence committees are conducting their own investigations, though they must rely on information collected by the F.B.I. and intelligence agencies.
At his confirmation hearing on Wednesday, former Senator Dan Coats, Mr. Trump’s nominee for director of national intelligence, told the Senate Intelligence Committee that “I think it’s our responsibility to provide you access to all that you need.”
Some Obama White House officials had little faith that a Trump administration would make good on such pledges, and the efforts to preserve the intelligence continued until the administration’s final hours. This was partly because intelligence was still being collected and analyzed, but it also reflected the sentiment among many administration officials that they had not recognized the scale of the Russian campaign until it was too late.
The warning signs had been building throughout the summer, but were far from clear. As WikiLeaks was pushing out emails stolen from the Democratic National Committee through online publication, American intelligence began picking up conversations in which Russian officials were discussing contacts with Trump associates, and European allies were starting to pass along information about people close to Mr. Trump meeting with Russians in the Netherlands, Britain and other countries.
But what was going on in the meetings was unclear to the officials, and the intercepted communications did little to clarify matters — the Russians, it appeared, were arguing about how far to go in interfering in the presidential election. What intensified the alarm at the Obama White House was a campaign of cyberattacks on state electoral systems in September, which led the administration to deliver a public accusation against the Russians in October.
But it wasn’t until after the election, and after more intelligence had come in, that the administration began to grasp the scope of the suspected tampering and concluded that one goal of the campaign was to help tip the election in Mr. Trump’s favor. In early December, Mr. Obama ordered the intelligence community to conduct a full assessment of the Russian campaign.
In the weeks before the assessment was released in January, the intelligence community combed through databases for an array of communications and other information — some of which was months old by then — and began producing reports that showed there were contacts during the campaign between Trump associates and Russian officials.
The nature of the contacts remains unknown. Several of Mr. Trump’s associates have done business in Russia, and it is unclear if any of the contacts were related to business dealings.
The New York Times, citing four current and former officials, reported last month that American authorities had obtained information of repeated contacts between Mr. Trump’s associates and senior Russian intelligence officials. The White House has dismissed the story as false.
Since the Feb. 14 article appeared, more than a half-dozen officials have confirmed contacts of various kinds between Russians and Trump associates. The label “intelligence official” is not always cleanly applied in Russia, where ex-spies, oligarchs and government officials often report back to the intelligence services and elsewhere in the Kremlin.
Steven L. Hall, the former head of Russia operations at the C.I.A., said that Mr. Putin was surrounded by a cast of characters, and that it was “fair to say that a good number of them come from an intelligence or security background. Once an intel guy, always an intel guy in Russia.”
The concerns about the contacts were cemented by a series of phone calls between Sergey I. Kislyak, Russia’s ambassador to the United States, and Michael T. Flynn, who had been poised to become Mr. Trump’s national security adviser. The calls began on Dec. 29, shortly after Mr. Kislyak was summoned to the State Department and informed that, in retaliation for Russian election meddling, the United States was expelling 35 suspected Russian intelligence operatives and imposing other sanctions. Mr. Kislyak was irate and threatened a forceful Russia response, according to people familiar with the exchange.
But a day later, Mr. Putin said his government would not retaliate, prompting a Twitter post from Mr. Trump praising the Russian president — and puzzling Obama White House officials.
On Jan. 2, administration officials learned that Mr. Kislyak — after leaving the State Department meeting — called Mr. Flynn, and that the two talked multiple times in the 36 hours that followed. American intelligence agencies routinely wiretap the phones of Russian diplomats, and transcripts of the calls showed that Mr. Flynn urged the Russians not to respond, saying relations would improve once Mr. Trump was in office, according to multiple current and former officials.
Beyond leaving a trail for investigators, the Obama administration also wanted to help European allies combat a threat that had caught the United States off guard. American intelligence agencies made it clear in the declassified version of the intelligence assessment released in January that they believed Russia intended to use its attacks on the United States as a template for more meddling.
“We assess Moscow will apply lessons learned,” the report said, “to future influence efforts worldwide, including against U.S. allies.”
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