According to the article:

The letter bearing Trump’s name, which was reviewed by the Journal, is bawdy—like others in the album. It contains several lines of typewritten text framed by the outline of a naked woman, which appears to be hand-drawn with a heavy marker. A pair of small arcs denotes the woman’s breasts, and the future president’s signature is a squiggly ‘Donald’ below her waist, mimicking pubic hair. The letter concludes: ‘Happy Birthday — and may every day be another wonderful secret.’

.....The president’s civil complaint was filed in Florida federal court against Dow Jones & Company Inc., which publishes the Journal; News Corp., which owns Dow Jones; Murdoch, director and majority owner of News Corp.; News Corp. CEO Robert Thomson; and the Journal reporters on the story, Khadeeja Safdar and Joseph Palazzolo.

One reason why Trump’s suit faces an uphill battle: He would have to clear the high legal bar for plaintiffs who are public figures. Known as the “actual malice” standard, it requires plaintiffs to show that defendants knew the information they published was false or recklessly disregarded the truth.

On that note, Trump’s complaint alleges that the civil defendants “possessed information and had access to information that showed their statements were false,” and that they published “with knowledge of the falsity of the statements, and/or with reckless disregard of their truth or falsity.”.....

Barring some truly surprising revelation about a professional outlet like the Journal’s conduct in reporting on and publishing the article, the prospect of discovery alone almost makes it hard to see Trump pressing the case that far. Does he want to produce oath-bound testimony about his relationship with Epstein that would fuel more news stories and put that relationship on front pages and social media feeds?.....

True, the president has secured monetary settlements from media organizations in cases that didn’t necessarily seem to warrant them. But a Dow Jones spokesperson said they “have full confidence in the rigor and accuracy of our reporting, and will vigorously defend against any lawsuit,” so this one might not be headed down that sort of path.