Donald Trump has placed himself at further risk of losing control of properties such as his Mar-a-Lago resort following his testimony in the New York civil fraud trial, according to an attorney.

Speaking on a podcast hosted by Mary Trump, niece and frequent critic of the former president, Joe Gallina suggested things "could not have gone worse" for Trump after he answered questions under oath about his financial statements on Monday.

Trump is accused by New York Attorney General Letitia James of filing fraudulent financial records for years which inflated the value of his properties and assets in order to obtain favorable bank loans and tax breaks. Trump denies all wrongdoing in connection to James' $250 million lawsuit.

Judge Arthur Engoron, who is overseeing the civil trial in New York, has already ruled that Trump had committed fraud by misrepresenting the value of his properties for years. The civil trial is now considering six remaining allegations in James' lawsuit, as well as the size of the penalty.