Cohen, who famously once declared he would "take a bullet" for Trump, is cooperating with Mueller and has spoken with the special counsel's office for more than 70 hours on topics beyond Moscow, a source with knowledge of the discussions told CNN.
He pleaded guilty earlier this year to eight counts in a separate case from the Manhattan US attorney's office. Cohen did not have an agreement to cooperate with prosecutors on that case.
Thursday's revelations are potentially significant because they appear to show that Trump was engaged in business dealings with Russia in the midst of a campaign in which Moscow interfered to help elect him.
They could also intersect with other information that Mueller knows to create political and legal jeopardy for the President.
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