Key witnesses are being sought by the DOJ for its Mar-a-Lago investigation.
A Trump ally is one of the witnesses.
In his testimony before the grand jury, he chose to invoke the Fifth Amendment.
The New York Times reported that an aide to Donald Trump had little to say about the investigation into the former president's handling of government documents.
In June, the aide was appointed by Trump to represent the National Archives and Records Administration in relation to access to presidential records.
A few months before FBI agents seized thousands of documents from Trump's Mar-a-Lago home, he claimed that the president had declassified "whole sets of materials."
When President Trump said "We are declassifying this information", he was with me.
A person familiar with the situation told The Times that, this month, he mostly chose to plead the Fifth Amendment in his grand jury testimony.
A request for comment was not responded to by the man.
The grand jury in Washington, DC, heard testimony from Patel for several hours.
According to The Times, federal prosecutors are hoping to get other witnesses to testify.
The Times reported that security footage showed a person moving boxes out of a storage room in Mar-a-Lago.
A number of claims were made about Trump's declassification.
Trump made a "sweeping reclassification order" via social media after FBI agents raided Mar-a-Lago.
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