Barron Trump tried to reach UK police from the United States after he video-called the alleged victim, a woman in London, and said he saw her being attacked.
Matvei Rumiantsev, 22, is on trial at Snaresbrook Crown Court accused of assault and two counts of rape, among other charges, against the alleged victim, who jurors have heard is friends with Barron Trump.
The court heard Trump called the alleged victim, who cannot be named for legal reasons, on January 18, 2025.
Shortly afterwards he spoke to police in London after he believed she was being assaulted, the court heard, and a transcript of the call was released by the Crown Prosecution Service (CPS).
"Oh I'm calling from the US, uh I just got a call from a girl, you know, she's getting beat up," the transcript said Trump told City of London Police in the call.
"This was happening about eight minutes ago. I just figured out how to, how to call someone. Uh, uh it's really an emergency."
In the call, Trump said he met the alleged victim on social media.
The court heard that in an email to police in London investigating the allegations, who asked if Trump would be willing to provide a witness statement, the US president's son wrote that what he saw was "very brief indeed but indeed prevalent".
"I didn't expect her to pick up due to the time difference," the email from May 2 said, jurors heard.
"The phone was picked up.
"The individual who answered was a shirtless man with darkish hair. This view lasted maybe one second ... then the view flipped to the victim."
The court heard the email continued: "I made two of my friends call the Met Police in the UK, even though they are in the US.
"As per evidence I do not have any, I was told by the victim who I am very close with that this individual was giving her difficulty for a long time."
Jurors heard that police replied to the email from Trump and did not receive a response to that or to a follow-up email sent on July 1.
Rumiantsev, who wore a blue suit and white shirt in the dock, denies assault, actual bodily harm, two counts of rape, intentional strangulation and perverting the course of justice by pressuring the woman to withdraw her complaints.
The trial continues.
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