Barron Trump may be one of the most private members of the Trump family, but a new behind-the-scenes detail is giving the public a rare peek at his bond with his famous father.

The 20-year-old NYU student has mostly avoided the spotlight for years. But now, a new book is shedding light on the sweet nickname President Donald Trump reportedly used for his youngest son during a tense family moment.

According to New York Times reporters Maggie Haberman and Jonathan Swan’s upcoming book, Regime Change: Inside the Imperial Presidency of Donald Trump, Barron once called his father in a panic after learning about the death of conservative activist Charlie Kirk.

The call reportedly happened on Sept. 10, 2025.

Barron, who was said to be a major fan of Kirk, was allegedly shaken by the news. The young Trump had previously been seated next to Kirk’s widow, Erika Kirk, at the State of the Union, making the tragedy feel even more personal.

But according to the book, Barron’s fear went beyond grief.

He was reportedly worried that his father, who has survived assassination attempts, could be next.

Trump’s response, according to the authors, was surprisingly tender.

“Calm down, honey, calm down,” the president reportedly told his son.

The nickname quickly raised eyebrows because Trump and former First Lady Melania Trump have long used affectionate terms for Barron, including “little boy” and “little Donald.”

Donald Trump’s other son, Eric Trump, has also said in the past that his father sometimes calls him “honey,” suggesting the nickname may be a family habit behind closed doors.

The new detail comes just days after Barron made a rare public appearance at Trump’s controversial Freedom 250 UFC event at the White House.

The spectacle was held on the South Lawn, where a special UFC arena was built for the highly publicized fight night. The setup drew criticism, but it also attracted a star-studded crowd.

Melania Trump, Ivanka Trump, Kai Trump and other members of the Trump family were on hand for the event. Top political figures including J.D. Vance, Marco Rubio and Pete Hegseth were also reportedly there.

The celebrity guest list included Joe Rogan, Shane Gillis, Tony Hinchcliffe and Luke Bryan.

For Barron, the appearance was notable because he has remained mostly out of view since his father returned to the White House. Unlike his older siblings, Barron has not taken on a regular public political role.

He spent part of his childhood in the White House during Trump’s first term, when he was just 10 years old. Melania was often credited with keeping him shielded from the intense public glare.

After graduating high school, Barron enrolled at New York University. He was previously believed to be living in Trump Tower while attending school in New York City.

However, recent reports suggested he may have shifted to Washington, D.C., for the semester, possibly through NYU’s satellite campus.

“From what I was told,” a campus security officer told PEOPLE, “he’s doing a semester at another NYU campus.”

Even though Barron has stayed quiet in public, Trump insiders have suggested he has become surprisingly influential behind the scenes.

Jason Miller, a senior adviser to Trump, previously said Barron helped guide his father’s media strategy by recommending podcast appearances.

“Barron has been very involved in selecting or recommending, I should say, a number of the podcasts that we should do,” Miller said on Politico’s Playbook Deep Dive podcast.

He added: “I got to tell you, hats off to the young man. Every single recommendation he’s had has turned out to be absolute ratings gold that’s broken the internet. He’s done a great job.”

Trump himself has also praised Barron’s instincts.

During the 2024 campaign, Trump said his youngest son would sometimes give him blunt advice.

“He’ll tell me sometimes, ‘Dad, this is what you have to do,’” Trump said.

For years, Barron has been seen as the mystery member of the Trump family — tall, quiet and rarely heard from.

But between his rare White House appearance, his reported influence on Trump’s media strategy and the newly revealed “honey” nickname, the once-shielded first son is suddenly back in the headlines.