From ABC News:

One of former president Donald Trump’s current attorneys told special counsel Jack Smith’s team that, within days of the Justice Department issuing a subpoena last year for all classified documents at Trump’s Mar-a-Lago estate, she “very clearly” warned Trump that if he failed to fully comply — but then swore he did — “it’s going to be a crime,” according to sources familiar with the matter.

Sources said the lawyer, Jennifer Little, told investigators Trump “absolutely” understood the warning, which came during a pivotal meeting at Mar-a-Lago with Trump and another attorney, Evan Corcoran, who had recently joined Trump’s legal team.