An aide to former President Donald Trump pleaded not guilty on Thursday to charges of concealing classified documents.

Walt Nauta, 40, appeared in Miami federal court with a Florida attorney, Sasha Dadan. He initially appeared in court on June 13, when Trump pleaded not guilty to 37 charges related to classified documents and obstruction of justice.

Since Nauta did not have a lawyer certified in the state, he was not able to enter a plea until Thursday.

Nauta allegedly concealed boxes of documents at Trump’s Mar-a-Lago resort. The Navy veteran faces five counts of concealing or withholding documents, taking part in a conspiracy to obstruct justice, and lying to a federal investigator about it.

Nauta’s trial is scheduled to begin August 14 in Fort Pierce, Florida, The Palm Beach Post reported. Federal prosecutors have asked to move the opening date to December.