Mazars USA, in a Feb. 9 letter made public on Monday, told the Trump Organization, the former president's New York-based real estate business, that its financial statements for 2011 through 2020 should no longer be relied on.
The disclosure was made as part of New York Attorney General Letitia James' civil investigation into the Trump Organization, which could result in financial penalties.
That probe partially overlaps a criminal investigation by the Manhattan District Attorney, which James joined in May, into the company's practices.
Mazars said it had based its conclusion on a January filing by the New York attorney general, its own investigation, and information from internal and external sources.
"While we have not concluded that the various financial statements, as a whole, contain material discrepancies, based upon the totality of the circumstances.
And we believe our advice to you to no longer rely upon those financial statements is appropriate," Mazars said in the letter addressed to the chief legal officer at the Trump Organization, Alan Garten.
In the letter, filed in New York state court, Mazars said that it had "performed its work in accordance with professional standards."
The accounting firm also said it would no longer work for the Trump Organization.
New York state's attorney general has accused the Trump Organization of repeatedly misrepresenting the value of its assets to obtain financial benefits.
A Trump Organization spokesperson said in a statement the company is "disappointed that Mazars has chosen to part ways."
But the spokesperson added the letter confirms that "Mazars' work was performed in accordance with all applicable accounting standards
And principles" and that the statements of financial condition "do not contain any material discrepancies."
The New York attorney general filed the Mazars letter in support of its efforts to compel the production of outstanding documents from Trump.
And his company as well as testimony by him and two of his adult children, Donald Trump Jr. And Ivanka Trump.
In a memorandum also filed on Monday, the attorney general noted media reports that Trump had destroyed documents covered by the Presidential Records Act
And wants him to supply a sworn statement on whether the files produced for her probe are complete and how they may have been destroyed and by whom.
In Monday's filing, James' office said the accounting firm's statement and actions further supported the legitimacy of the investigation.
James has been investigating whether Trump inflated real estate values to obtain bank loans, and reduced values to lower tax bills.
|Exposed In 2022
What is the most accurate trading indicator?
In one example, she said Trump's annual financial statements said an apartment he personally owned in Trump Tower was 30,000 square feet(2,787 square meters) when it was in fact a third that size.