The New York Times, March 1st, here:
In the Obama administration’s last days, some White House officials scrambled to spread information about Russian efforts to undermine the presidential election — and about possible contacts between associates of President-elect Donald J. Trump and Russians — across the government. ...
American allies, including the British and the Dutch, had provided information ... classified intelligence.
Separately, American intelligence agencies had intercepted communications of Russian officials, some of them within the Kremlin, discussing contacts with Trump associates. ...
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 . . ..
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 classification level 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 analysts to share information.
There was also an effort to pass reports and other sensitive materials to Congress. ...
... [W]ith the most sensitive intelligence, including the names of sources and the identities of foreigners who were regularly monitored . . . [o]fficials 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. ...
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 . . ..