The New York attorney general has asked a judge to order the testimony of Donald Trump's son in a probe of the president and his private businesses.
The investigation centres on whether Eric Trump and the Trump Organization improperly inflated assets.
Mr Trump, executive vice-president of the Trump Organization, dismissed the probe as "prosecutorial misconduct".
The investigation is one of several into the president's business dealings. Mr Trump denies any wrongdoing.
Last month, Manhattan District Attorney Cyrus Vance Jr, who is seeking the president's tax returns, said in court documents that his office was investigating "protracted criminal conduct" at the Trump Organization.
New York State Attorney General Letitia James launched the civil inquiry in March last year, after Mr Trump's former personal lawyer, Michael Cohen, testified before US lawmakers that the president had inflated the value of his assets to banks when seeking loans, and understated them to lower his taxes.
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