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But his involvement in key episodes under scrutiny, and his leadership of the campaign at a time when prosecutors say Russian intelligence was working to sway the election, may make him an especially valuable witness.

Manafort pleads guilty, will cooperate with special counsel →

But when special counsel Robert Mueller charged a dozen Russian intelligence agents with hacking this July, the indictment clarified the potential for damage.

Will Russian hackers affect this year's US election? →