WASHINGTON, DC: Natalie Harp's "obsessive" behavior toward President Donald Trump sparked security concerns, journalist Michael Wolff has claimed in his recent book about the president.

The book titled, 'All or Nothing: How Trump Recaptured America', scheduled to be published on February 25, offers a behind-the-scenes glimpse of Trump's 2024 presidential election campaign.

Michael Wolff mentioned in his book that the 33-year-old was a member of a group of female staffers with whom the president reportedly had an "avuncular and flirtatious" relationship, as per The Telegraph.

Harp reportedly wrote in a letter to Trump, "You are all that matters to me." During the first day of Trump's criminal trial in New York, she slipped him a letter that had Bible verses.

Wolff further wrote in his book that the "aggressiveness" of Harp's attention and her "fury" on being denied the attention of Trump sparked serious concerns within the security team.

The president went as far as to reject security concerns about Harp being allotted a desk outside the Oval Office in the White House, per the outlet. Trump had reportedly said at the time, "Nonsense... She just loves her president."