ISIS has for the first time apparently used an American child in a propaganda video, as a 10-year-old boy issues a warning to President Donald Trump, The Daily Beast reported on Wednesday.

"My message to Trump, the puppet of the Jews: Allah promised us victory, promised you defeat," said the child, who gives his name as Yousef. "This battle is not gonna end in Raqqa or Mosul. It's gonna end in you lands."

The video has not yet been officially verified, the UK newspaper the Mirror reported.

In the video, Yousef speaks in clear, unaccented English, supposedly from Raqqa, but his real identity is unknown. Yousef said he moved to Syria from the United States with his family two years ago and that his father is an American soldier who fought the mujahideen in Iraq.

"While this is the first time they have used an American child speaking, it's significant that he identifies his father as a former U.S. soldier and makes an overt threat to Trump," Mia Bloom, a professor at Georgia State University who studies terrorist groups, told The Daily Beast. "The use of children in this way is intended to show the conflict is multi-generational. That even the kids are radicalized."

The boy speaks about the unifying power of the caliphate for much of the video. He appears alongside a boy identified as his "best friend," a Yazidi child taken from Sinjar and now being raised to be a soldier for ISIS.