Mary Jordan's book "The Art of Her Deal: The Untold Story of Melania Trump," has been swiftly denounced by the White House.

It includes claims the first lady learnt details about Trump's alleged infidelities from media reports during the 2016 campaign.

Jordan, a reporter for The Washington Post, wrote that the incoming first lady wanted time to cool off and amend her financial arrangement with Trump to ensure the financial future of herself and their son, Barron. Melania Trump has said that she wanted to wait until the end of the school year to move to Washington.

Stephanie Grisham, a spokeswoman for Mrs. Trump, said the book was based on inaccurate information. "Yet another book about Mrs. Trump with false information and sources," Grisham said in an emailed statement. "This book belongs in the fiction genre."

The first lady and Barron, who was 11 at the time, settled into the White House in early June 2017 and she seemed visibly happier by mid-2018, the book said.

"According to three people close to Trump, a key reason was that she had finally reached a new and significantly improved financial agreement with Trump, which had left her in a noticeably better financial position," Jordan wrote. "Those sources did not know precisely what she sought, but it was not simply more money."

Jordan writes that Melania Trump wanted "proof in writing" that Barron would be treated more of an equal to Trump's oldest three children when it came to financial opportunities and inheritance.

Australian Associated Press