Confidence Man: The Making of Donald Trump and the Breaking of America by Maggie Haberman:
Before they married, however, Roy Cohn intervened to protect Trump’s interests once again. After advising him, futilely, not to get married—“I don’t know why you want to do this”—Cohn persuaded Trump to get his fiancée to sign a prenuptial agreement. One version included a bonus for each child she had; that provision was excised from the signed deal. Another called for her to return any gifts Trump gave her during the marriage if they divorced, a stipulation that pushed her away from the negotiating table. She eventually returned once the terms were changed.
The agreement included a phrase that seemed to codify Trump’s professed uninterest in personally living the high life by establishing that his current preferences were neither “opulent nor extravagant.” In fact, the way he lived would become ostentatiously opulent and extravagant, but it was already the opinion of Cohn—and possibly Trump too—that Ivana craved a more expensive lifestyle, and the prenuptial agreement was essentially, according to Barrett, a “gold-digger warning.”