Sources said the email occurred in June 2016 around the time of the recently revealed Trump Tower meeting where Russians with Kremlin ties met with the president’s eldest son, Donald Trump Jr., his son-in-law Jared Kushner as well as then-campaign chairman, Paul Manafort. While many details around the Dearborn email are unclear, its existence suggests the Russians may have been looking for another entry point into the Trump campaign to see if there were any willing partners as part of their effort to discredit — and ultimately defeat — Hillary Clinton.<

Dearborn’s name has not been mentioned much as part of the Russia probe. But he served as then-Sen. Jeff Sessions’ chief of staff, as well as a top policy aide on the campaign. And investigators have questions about whether he played a role in potentially arranging two meetings that occurred between the then-Russia ambassador to the US, Sergey Kislyak, and Sessions, who has downplayed the significance of those encounters.