Retired Lt. Gen. Michael Flynn, an adviser to President-elect Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE, received classified national security briefings last summer while also running a private consulting firm that offered "all-source intelligence support" to international clients, Yahoo News reports.

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Flynn, who has reportedly been offered the role of national security adviser in Trump's administration, said his relationship with his company, the Flynn Intel Group, would be "severed" if he returned to government.

But Flynn began sitting in on briefings for Trump in August while working for foreign clients.

Those classified national security briefings are provided to the major presidential candidates and their top aides.

Norm Eisen, who served as President Obama's ethics adviser, called Flynn's conflict "profoundly troubling" and "disqualifying."

Flynn was reportedly offered a position as national security adviser to Trump on Thursday.

Flynn has held a number of military roles throughout his career, serving as the director of the Defense Intelligence Agency and chair of the Military Intelligence Board.

Throughout Trump's campaign, Flynn has also served as a military adviser, giving Trump advice on questions of foreign policy and military strategy.