Donald Trump's favorite White House aide has a secret brother who has fled to Central America and is badmouthing the President at every turn.

And Preston Harp – whose sister Natalie is dubbed Trump's 'human printer' for her habit of sharing printed copies of articles and social media posts that he wants to read – isn't the only family member now estranged from the President's right-hand woman.

The tragic 2020 death of Natalie's father created a deep schism in Harp's family – leaving her closely bonded to her mother, Jill, but estranged from other relatives.

Now Preston and other family members have spoken exclusively to the Daily Mail, just as Harp's closeness to Trump comes under ever more scrutiny. 

The tight relationship between Harp, 34, and the 80-year-old President first caught media attention when she praised him as her savior in 2019. 

Then in her 20s and having recovered from stage II bone cancer, Harp publicly declared that Trump had saved her life by signing his federal Right to Try Act, which opened the door for an experimental life-saving cure.

The President subsequently gave her a speaking gig at the Republican National Convention in August 2020.

However, what was not known when she took the stage was that her family was still reeling from a shocking tragedy that had occurred just one month prior and from which they would ultimately never recover.

Living in two worlds

In the exclusive interview with the Daily Mail, Harp's estranged brother Preston, 38, slammed Trump as a 'national embarrassment', and said that his sister's relationship with the president is 'very unhealthy'.

'She's just like his fan club,' Preston said from his new adoptive homeland of Nicaragua. 

Preston moved to the Central American country in 2023 to live under the authoritarian rule of Daniel Ortega, who has called Trump 'mentally deranged' for his handling of the war in Iran.

Now a long-haired hippie, Preston has been working alongside S Brian Willson, an 85-year-old activist who was designated a domestic terror suspect by the Reagan administration.

Preston couldn't live more differently to his younger sister.

As she dons designer dresses and heels to hop on and off Air Force One closely behind the leader of the free world, Preston lives in T-shirts and baseball caps in a $60-a-month room in a suburb of the Nicaraguan capital of Managua.

He suffered an incapacitating injury earlier this year, tripping over a bike tire at night and breaking his kneecap. He is still slowly recovering and says he is thankful for Nicaragua's socialized, free healthcare that has paid for his treatment.

Preston has been working with Willson, editing his memoirs and other anti-imperialist writings. The octogenarian lost both legs when he lay down in front of a Navy munitions train destined for anti-communist rebels in Central America in 1987.

Preston had no idea his sister had started working for Trump until a friend pointed him to a Daily Mail article about a 'glamorous new assistant' in March 2023.

'He's like, "Hey, did you see the Daily Mail?" And he's like, "No, look at this," and I'm like, "Oh my gosh, my sister's in the Daily Mail, and working for Trump!",' he said.

'And I had no idea,' he added. 'And so it just kind of caused some cognitive dissonance.

'I don't understand why my sister, or anyone could want to work for Trump.'

Natalie Harp did not respond to requests for comment on this article but friends say she fears for her brother's mental health. Preston concedes he had a hard time in 2015 when he received psychiatric treatment following a car accident but says he has no ongoing mental health problems.

White House press secretary Karoline Leavitt did not comment on the complicated family dynamics but called Harp one of the 'most loyal and hardest working aides on President Trump's team'. 

Family tragedy and a bitter division

Harp and her brother were close growing up in California. 

Preston, who shared exclusive photos of his family with the Daily Mail, fondly recalls playing games in which his younger sister would pretend her dollhouse was burning and he'd come to her rescue in a fire engine.

They were home-schooled by their parents with their mother taking the lead in their education using Christian textbooks.

Preston described his mother as 'extremely conservative' and 'deeply religious'.

'The focus for my mom's kind of Christianity just really seemed about preaching about hellfire,' he told the Daily Mail.

'She'd even force me to throw away my Pokémon cards because she saw them as demonic.'

But while he was rebellious, Preston described his sister as a dutiful child, following her mom's instructions to the letter.

'Natalie just kind of followed my mom,' he said.

By contrast, Preston earned his mother's scorn for listening to rock music, skateboarding and reading library books by authors such as Carl Sagan and Jack Kerouac.

Preston said his father, Robert, was more supportive of his free spirit. Robert had studied to be a pastor and later became a professor at Biola University, an evangelical Christian school in La Mirada, California.

Preston briefly studied at Biola himself but said he was kicked out because of his perceived lack of faith and later graduated with a degree in philosophy from nearby Chapman University.

At first, he maintained contact with his family, he said, but had an increasingly difficult time communicating with his sister.

He said when he called the house, his mother wouldn't let him talk to Harp without her listening in on the call.

'I'd have to talk to her while my mom could hear what we're talking about because she thought I was a bad influence,' Preston said.

Jill Harp, now 64, did not respond to our request for comment.

As Preston grew more distant from his mother and sister, he maintained a close bond with his father. They would go out to dinner and enjoyed hikes together.

Then Covid arrived.

Robert Harp spent the last six months of his life locked down with his wife and grown daughter at the family home in Irvine, California during the pandemic.

On the morning of July 17, 2020, Harp called her brother to report a family emergency.

Preston rushed over from his new home in nearby Santa Ana to see his father's body being carried off on a stretcher.

An Orange County coroner ruled his death a suicide.

Already divided by religion, the family disagreed on how to react to the tragedy.

'My mom and sister wanted to say that he died in his sleep. I just can't keep that kind of a secret,' said Preston.

He then shared news of his father's suicide with Harp's extended family – sparking a sibling rift which has not been resolved.

Other family members contacted by the Daily Mail admitted there was a family fallout over Robert's suicide and the fact that there was no funeral, just a private cremation.

Harp's paternal grandmother Dolores 'Dee Dee' Harp, 88, who was widowed in 2024, said of her granddaughter: 'She doesn't call me. I've accepted that's the way it is.'

Carolyn Creutzer, a cousin, said Harp has blocked her on social media.

A month after her father's death, Harp delivered that speech at the RNC in North Carolina.

She and her mother left California weeks later and moved together into an 18th floor apartment in West Palm Beach, Florida, just three miles from Trump's Mar-a-Lago private members club, where they built inroads with the President at the center of the MAGA universe.

Harp the took an anchor job with the conservative One America News Network, before joining Trump's presidential election campaign in 2022.

After his re-election in November 2024, it was announced that she would be working in his administration.

For his part, Preston has worked various jobs as a musician and grocery clerk.

He traveled to Nicaragua for the first time in 2022, describing it as 'the first I'd felt at peace since my dad died'.

He said he feels at home in the Central American nation and finds added meaning in life by working for Willson, who has described Preston as a 'gift from the heavens'.

'Shortly after Gringo Preston Harp arrived in Nicaragua from the United States, he discovered that my writings and essays were articulating values similar to his,' Willson told the Daily Mail.

'He asked if he could volunteer with me. Working solo while living in Nicaragua in my mid-eighties, I was thrilled to have an assistant who was an excellent writer, editor, and an anti-imperialist thinker/activist like me,' he added. 

Preston says he has no desire to re-connect with his sister or their mother, and has no plans even to return to the United States.

'It's hard to believe that's my sister and my mom,' he said. 'I can't connect with that vibe, so I'm just going to let it be.'