Donld Trump speaks at campaign rally in Houston, Texas

Donald Trump’s eldest son has testified in the fraud case brought against the family firm, acknowledging his leading role in the business but insisting that he relied on the advice of accountants when approving the financial statements that are at the heart of the case.

Donald Trump Jr, 45, is named alongside his brother Eric and their father, the former president, in a $250 million suit filed by the state of New York accusing them of falsely inflating the value of Trump Organisation properties to obtain better deals from lenders and insurance companies.