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"F.B.I. agents sent an informant to talk to two [Trump] campaign advisers only after they received evidence that the pair had suspicious contacts linked to Russia during the campaign," the N.Y. Times reports:
Details: "The informant, an American academic who teaches in Britain, made contact late that summer with one campaign adviser, George Papadopoulos."
- "He also met repeatedly in the ensuing months with the other aide, Carter Page, who was also under F.B.I. scrutiny for his ties to Russia."
Intrigue: "The informant is well known in Washington circles, having served in previous Republican administrations and as a source of information for the C.I.A. in past years."
- "The New York Times has learned the source’s identity but typically does not name informants to preserve their safety.
- WashPost: "The Washington Post ... has confirmed the identity of the FBI source who assisted the investigation, but is not reporting his name following warnings from U.S. intelligence officials that exposing him could endanger him or his contacts."
P.S. "Mueller has subpoenaed a key assistant of long-time Donald Trump adviser Roger Stone," Reuters reports. "John Kakanis, 30, who has worked as a driver, accountant and operative for Stone.
Go deeper: Axios' David Nather, "Where the 'FBI spy in the Trump campaign' story came from."