https://www.nbcnews.com/think/opini...le-mueller-investigation-will-have-ncna941741
Allegations that Manafort was Trump's mole in the Mueller investigation will have consequences
The “mole-in-the-Mueller-investigation” subplot, meanwhile, will have consequences for all involved. It is now impracticable for Mueller to call Manafort as a testifying witness in future trials. But if Manafort has provided information that could help convict other targets of the investigation, Mueller will be unable to use said information in a court of law (though it could potentially be used in an impeachment hearing). Obviously, this could hamper Mueller’s efforts in certain respects.
Allegations that Manafort was Trump's mole in the Mueller investigation will have consequences
The “mole-in-the-Mueller-investigation” subplot, meanwhile, will have consequences for all involved. It is now impracticable for Mueller to call Manafort as a testifying witness in future trials. But if Manafort has provided information that could help convict other targets of the investigation, Mueller will be unable to use said information in a court of law (though it could potentially be used in an impeachment hearing). Obviously, this could hamper Mueller’s efforts in certain respects.