Intercepted phone calls and phone records show that several aides and allies to Donald TrumpDonald TrumpTrump: I was 'psyched to terminate' NAFTA Trump: 'Major, major' conflict with North Korea possible Cohn: People 'wasting time' calling for Trump's tax returns MORE's presidential campaign were in repeated contact with senior Russian intelligence officials, according to The New York Times.
On Monday, Flynn announced his resignation over the exchange after he initially mislead officials, including Vice President Pence, about the contents of his conversation with Kislyak. He reportedly discussed sanctions with Kislyak before Trump's inauguration; he said this week they specifically discussed the 35 Russian officials expelled from the U.S. as part of the Obama administration's sanctions and that "no lines were crossed."
The Times noted that the other aides' conversations were initially discovered by the National Security Agency during a routine foreign surveillance operation.
Following the discovery, the FBI requested that the NSA analyze other intercepted communications and gather intelligence on the Russian operatives to look for any evidence of collusion.
The Times also reported that the FBI is currently analyzing the unverified dossier compiled by a former British intelligence operative, Christopher Steele, who alleged that Russian officials had compromising information on Trump.
The report noted that the claims in the dossier have not been confirmed by the FBI but added that one U.S. official said that the bureau has contacted several of Steele's sources.