Mr Trump and Mr Giuliani have clashed over what the president knew and when he knew it.
The president has claimed that he did not reimburse his attorney for the payment, but in an appearance on Hannity on Fox News a couple of weeks ago, Trump's attorney Rudy Giuliani indicated otherwise.
Trump's latest disclosure form, which the office released on Wednesday, reflected that he reimbursed the amount in 2017 to his lawyer Michael Cohen, who arranged the nondisclosure agreement with Daniels.
And David Apol, director of the Office of Government Ethics, referred the matter to the Justice Department. He said he had not been reimbursed by Trump's company or Trump's campaign. The one consistent element that each person on Trump's side has maintained is that the payment was not illegal and did not run afoul of any campaign finance laws.
A recent Bloomberg article stated that Novartis had made approximately $1.2 billion Dollars in payments to Cohen in an agreement signed by Ehrat and Novartis former-CEO, Joe Jimenez. Trump denies the alleged affair with Daniels, who has said she prefers using her stage name to her real name of Stephanie Clifford.
Mr Apol's letter was released with the Trump disclosures.
The document, which covers calendar year 2017, showed total income from Trump's business operations and investments of at least $453 million and assets valued at a minimum of $1.4 billion.
All those 12-month figures are down from the president's previous report, but that earlier one covered about 14 months so it is not comparable.
His Washington, D.C., hotel near the Oval Office, a magnet for diplomats and lobbyists, took in $40 million.
The Mar-a-Lago resort owned by President Trump in Palm Beach, Fla.
That means the debt was improperly omitted from last year's filing.
His Doral golf course and resort in Miami took in 75 million dollars (£55.3m). Meanwhile, Trump's D.C. hotel - which, fortuitously, opened its doors in September 2016 - has become one of the mogul's best-performing properties, as the patronage of foreign diplomats helped the venue produce $40.4 million in revenue past year. A large share of that debt stems from Deutsche Bank loans to Trump National Doral.
President TrumpDonald John TrumpOregon governor to face state rep in November Ashford, Eastman neck and neck in Nebraska Dem primary Progressive pick Wild wins Dem primary for Pa. House seat MORE's longtime personal attorney, Michael Cohen, reportedly offered Qatari government officials access to the president in exchange for at least $1 million.