The Department of Justice is preparing to ask a Washington, DC grand jury to indict former president Donald Trump for violating the Espionage Act and for obstruction of justice as soon as Thursday, adding further weight to the legal baggage facing Mr Trump as he campaigns for his party’s nomination in next year’s presidential election.

The Independent has learned that prosecutors are ready to ask grand jurors to approve an indictment against Mr Trump for violating a portion of the US criminal code known as Section 793, which prohibits “gathering, transmitting or losing” any “information respecting the national defence”.