A longtime senior executive at former US President Donald Trump's family business has pleaded guilty to helping it plot a 15-year tax fraud, according to a report.

A New York judge has threatened to hold Donald Trump in contempt of court and fined him $10,000 a day.

Former US President Donald Trump on Wednesday appealed a contempt ruling by a judge in New York over his failure to comply with a subpoena by the state attorney general about his business dealings.

New York’s attorney general on Thursday asked a state judge to hold Donald Trump in contempt of court for not turning over documents she subpoenaed for her civil investigation into the former US president’s business practices.

New York's attorney general is seeking to question Trump under oath as part of a civil investigation into alleged fraud within the Trump Organization, according to media reports.

A US congressional committee has found that former US President Donald Trump hid millions of dollars in payments from foreign governments that came through his lavish hotel in Washington, DC.

Former US President Donald Trump's company, the Trump Organization, is under pressure to comply with a New York state civil probe into the firm’s financial dealings.