Mr Flynn has pleaded guilty to making false statements about contact with Russia’s ambassador.
The White House says his guilty plea only implicates him however, unconfirmed media reports claim Flynn may testify about presidential involvement.
Ty Cobb, a White House attorney, said in a statement “Nothing about the guilty plea or the charge implicates anyone other than Mr Flynn,”
Flynn’s decision to cooperate with the investigation marked a major escalation in the investigation.
Flynn said his decision to plead guilty was “made in the best interests of my family and of our country”.
Donald Trump’s administration had been dogged by the investigation since President Trump took office in January.
Flynn was charged with one felony charge of lying about two private conversations he had with Russian ambassador Sergey Kislyak, a charge that carries a penalty of up to five years in prison.
A court document released Friday shows the conversations focused on U.S. sanctions that were being imposed on Russia by the administration of then-U.S. President Barack Obama.
The document, signed by Special Counsel Robert Mueller, says that in January, days after Trump’s inauguration, Flynn “did willfully and knowingly make materially false, fictitious, and fraudulent statements and representations” to investigators about the conversation with Kislyak.