Donald Trump's aide and co-defendant pleaded not guilty Thursday to additional federal charges alleging he misled investigators who attempt to retrieve classified records from Mar-a-Lago after the former president left office.

Walt Nauta, a valet for Trump, pleaded not guilty to charges of obstruction of justice and false statements before U.S. Magistrate Judge Shaniek Mills Maynard. Another co-defendant in the case, Carlos De Oliveira, a property manager at Trump's resort home, did not enter a plea because he has not yet obtained a local attorney.

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Special counsel Jack Smith has accused the pair of co-defendants of conspiring with the former president to block a year-long investigation into his retention of sensitive records.

Trump said he would not appear at the Alto Lee Adam Adams Sr. United States Courthouse in Fort Pierce. He waived his right to appear in court filings and also pleaded not guilty to three new charges added in late July, including two counts of obstruction and one count of willfully retaining national defense information.

This is a developing story and will be updated.