Donald Trump Jr. admitted that he ‘knows nothing’ about general accounting practices as prosecutors tried to portray him as ill-suited to sign off on the Trump Organization’s financial statements.

The former president's eldest son was grilled about his education, when he started at his father's company, and the jailed former CFO Allen Weisselberg as he took the stand at the $250million New York civil fraud trial.

According to the lawsuit, Don Jr. and Eric were involved with drawing up fraudulent financial statements, allegations which they both deny.

The lawsuit states that Don Jr. was the person who certified the financial statements after his father became President in 2017, at which point he and Eric took over the running of the Trump Organization.

'I should have worn makeup!' the 45-year-old joked as photographers took pictures of him while he sat at the bench with his lawyers.