Natalie Harp Boards Marine One to Travel with President Trump After Letters Revealed

Natalie Harp is letting the allegations she's obsessed with President Trump roll off her shoulders ... as she was seen boarding Marine One to travel with the prez Friday.

Photogs snagged a snap of her -- all pretty in a blue and white ankle-length gown paired with nude heels -- as she climbed up the steps into the United States Marine Corps aircraft.

She flew to Myrtle Beach, South Carolina alongside Trump and White House Press Secretary Karoline Leavitt for a campaign rally for U.S. Senator Darline Graham ahead of Tuesday's South Carolina Senate runoff.

While encouraging folks to vote, Trump interestingly told them to pretend his name was on the ballot "one more time."

Back to Natalie -- she's been the talk of town all week after her brother, Preston, slammed her for having "an unhealthy obsession" with 47. He also took a dig at him, saying his sister certainly isn't attracted to him physically.

And Friday, we saw intimate letters Trump's executive assistant wrote him back in 2023 ... including one in which she apologized for contacting him instead of the Secret Service when she was stranded at an airport. She also expressed her regret for stepping on a golf course while he was playing instead of staying on the cart.

Natalie penned to Trump she wants "things to always be right between" them in another part of the head-turning letter.

In a second letter, she expressed her concern he has an unfavorable view of her ... and later wrote he has the "absolute right to cuss me out, if need be, when I deserve it, because no one knows or cares about me more."