A former lawyer for Donald Trump warned the ex-president late last year that harboring government documents at home could put him in legal jeopardy, sources told The New York Times in a report published Monday.

Onetime White House attorney Eric Herschmann emphasized the importance of returning the material, three people familiar with the conversation said. Trump thanked Herschmann for the counsel but was noncommittal about giving back the files, according to the three sources.

The reported discussion bolsters evidence that Trump knew there could be consequences of taking home government materials. He allegedly squirreled away top-secret files that reportedly included sensitive nuclear information . FBI agents seized documents in a raid of Mar-a-Lago, Trumps Florida club and residence, last month.

It is not clear whether Herschmann, who did not work for Trump at the time of the reported conversation, had knowledge of the contents of the documents in the former presidents possession, according to the Times.

The Justice Department is also determining whether Trump or his colleagues engaged in obstruction. A judge Trump appointed while president recently granted his request for a special master to vet the documents, a small legal victory for the former president.

Trump has denied any wrongdoing and made veiled threats that the country would erupt in violence if he were criminally indicted.

Herschmann represented Trump in his first impeachment trial. More recently, he dismissed Trump allies claims of election fraud and their efforts to overturn the results as nuts .

Herschmann declined to comment to the Times.

Trumps office did not immediately respond to HuffPosts request for comment.