Fresh scrutiny of President Donald Trump and first lady Melania Trump's marriage is intensifying after biographer Michael Wolff said an unnamed senior campaign aide told him Melania "hates his guts," an allegation the president's representatives have forcefully rejected.

Wolff made the claims on the Inside Trump's Head podcast with Joanna Coles, days after the Trumps appeared together at the IndyCar Freedom 250 Grand Prix in Washington, D.C., on Aug. 23. The couple rode in the presidential limousine around the track and jointly participated in the ceremonial start of the race.

The appearance stood out because Melania has maintained a relatively limited public schedule during Trump's second term. Three days earlier, she appeared at a White House Rose Garden event announcing a $2 million foster-youth scholarship program involving IndyCar and Fox Corporation, telling attendees, "I heard you missed me."

Wolff, who has written extensively about Trump and his family, said he questioned a close aide during the 2024 presidential campaign about Melania's absence from the campaign trail. According to Wolff, the aide responded: "You mean you want a reason? The reason is that she hates his guts. She hates him."

Wolff further claimed the president and first lady are "seldom in each other's company" and don't regularly speak. He has previously argued that Melania's absence from significant political events reflected marital distance rather than concerns about security or scheduling.

Discussing Melania's absence from the 2024 Republican National Convention, Wolff said she stayed away because "she just didn't want to sit next to her husband." He added: "Not because he was going to be shot, but because she hates him."

Those allegations haven't been independently substantiated, and Wolff didn't identify the aide he said provided the account. The Trumps haven't publicly described their marriage in terms resembling Wolff's characterization, making the claims dependent largely on his reporting and unnamed sources.

Trump's representatives have rejected the account in unusually strong terms. A spokesperson for the president's legal team called Wolff a "serial liar" and described his latest assertions as "malicious, defamatory, and completely false fabrications."

White House spokesman Davis Ingle has previously attacked Wolff's credibility in similarly blunt language, calling him "a professional scumbag and serial liar." The first lady's office hasn't separately responded to the latest podcast allegations.

The Trumps' interaction at Sunday's race nevertheless attracted attention online. Some observers interpreted a moment in which Melania moved her hand toward the president during an exchange as evidence of tension, while Coles described the scene as "trouble in paradise."

Short video clips and photographs provide little reliable basis for determining the state of a marriage, however. The two later appeared publicly with drivers and guests at the event, adding another high-profile joint appearance to what has otherwise been Melania's comparatively sparse public schedule.

Wolff and Coles also discussed White House aide Natalie Harp, whose proximity to Trump has generated growing public attention. Coles asked whether Harp was "Marla Maples-ing Melania," invoking Trump's second wife, Marla Maples, and the collapse of his first marriage to Ivana Trump.

Wolff said the historical parallel was that Maples "came on the scene" and, "by her own sense of presence and publicity, helped push Ivana out." The discussion didn't provide evidence of a romantic relationship between Trump and Harp, and speculation about such a relationship shouldn't be treated as established fact.