Donald Trump is accused of pressuring an employee to delete security footage at his Florida home, in new criminal charges related to his alleged mishandling of classified files.

The new indictment adds one count of wilful retention of defence information and two of obstruction, making 40 charges in total in this case.

Mr Trump denies any wrongdoing and has called the prosecutor "deranged".

He is fighting multiple legal cases as he runs for president again.

A staff member at the former US president's Mar-a-Lago estate, Carlos de Oliveira, has also now been indicted.

He is alleged to have asked what could be done to delete the footage - which prosecutors say shows illegally-held files being moved.

Mr Trump has pleaded not guilty alongside his close aide Walt Nauta, who also received two additional charges of obstruction on Thursday.

The revised indictment outlines alleged efforts between Mr Nauta and Mr de Oliviera, the property manager at Mar-a-Lago, to obstruct the justice department's investigation.

According to the new court documents, Mr Nauta and Mr de Oliveira conspired to delete footage from security cameras after the Department of Justice issued a subpoena asking for surveillance footage of the basement where it said confidential documents were held.

In the court documents, Mr de Oliveira is claimed to have texted another employee who was the director of information technology that "the boss" wanted the server deleted.