A niece of President Donald Trump will divulge a series of damaging stories about him in an upcoming book, the first time that the president could be forced to grapple with unflattering revelations by a member of his own family.

The niece, Mary Trump, will release the book, “Too Much and Never Enough: How My Family Created the World’s Most Dangerous Man,” on July 28, according to her publisher, Simon & Schuster. The Daily Beast first reported on the book on Sunday.

In the book, Mary Trump, 55, will say she was a primary source for The New York Times’ coverage of Trump’s finances and provided the newspaper with confidential tax documents. A spokeswoman for The Times declined to comment on Sunday. The White House did not respond to a request for comment.

Three journalists from The Times received the Pulitzer Prize for explanatory reporting last year for their work providing an unprecedented look at the Trump family’s finances and contradicting Trump’s image as a self-made billionaire.

Mary Trump is the daughter of Fred Trump Jr., the president’s older brother, who died in 1981. She has mostly kept out of the public eye, except for a family feud over the will of the Trump family patriarch, Fred Trump Sr., who died in 1999.

Several former White House aides and Trump administration members have written books that have been problematic for the president, including former FBI director James Comey; Andrew G. McCabe, a former deputy FBI director; Cliff Sims, a former Trump aide; and an anonymous official who published a scorching indictment that questioned the president’s fitness for office.

This summer, Simon & Schuster is also publishing a memoir by John Bolton, Trump’s former national security adviser. The book’s release has been complicated by disputes over what the Trump administration contends is classified information. In his memoir, Bolton recounts how the president held up security assistance to Ukraine as leverage to get officials there to take up investigations into Democrats, including the Bidens — a scandal that led to the president’s impeachment.

(Simon & Schuster also published Trump’s own campaign book, “Great Again,” through its imprint Threshold Editions.)

A book by a member of the president’s own family is likely to be a lightning rod. Mr. Trump is facing criticism for his handling of the pandemic and the nationwide protests against police brutality, and his niece’s book is scheduled to come out just a few months before the election.

Mary Trump has largely stayed out of the spotlight during the Trump presidency, but she has criticized her uncle in the past, after she and her brother filed a lawsuit over the will of Fred Trump Sr., the president’s father. In the suit, Mary and her brother claimed that Donald Trump and his siblings had exercised “undue influence” over the distribution of Fred Trump’s estate, which was worth hundreds of millions of dollars. In a rare interview with The New York Daily News in 2000, Mary Trump blasted her uncle and his siblings.

“My aunt and uncles should be ashamed of themselves,” she said. “I’m sure they are not.”

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