Walt Nauta, a personal aide to former President Donald Trump, pleaded not guilty on July 6 in a Miami courtroom to helping Mr. Trump hide classified documents from law enforcement.

Mr. Nauta was indicted last month in special counsel Jack Smith’s probe of the former president’s handling of classified documents. While he was initially scheduled to appear in court alongside Mr. Trump on June 13, his arraignment was postponed as he didn’t have a defense attorney who was authorized to practice in Florida.

Last week, the date was pushed back again because of a canceled flight.

Ahead of his arraignment, Mr. Nauta hired Sasha Dadan, a criminal defense attorney and former public defender based in Fort Pierce, where the judge handling the trial is based. Ms. Dadan appeared in court with Mr. Nauta and his Washington lawyer, Stanley Woodward, who entered the plea on behalf of his client.