https://www.snopes.com/video-beating-dutch-boy-crutches/
Did a 'Muslim Migrant' Beat Up a Dutch Boy on Crutches?
A video of a teenager beating up a person on crutches was shared by President
Donald Trump along with the claim that the antagonist was a "Muslim migrant.

Shortly after this video was posted to Dumpert.nl, Dutch police officers were
able to locate the attacker and arrest him. A news report from the Telegraaf
identified him as a 16-year-old boy from Monnickendam. The report made no
mention of the boy’s religion.

Further, when this months-old video was brought back into the spotlight in
November 2017 thanks to a retweet from President Trump, Dumpert.nl posted a
short article that mocked Trump for sharing the video:

(By the way, fake news! Perpetrator was not a Muslim and not an immigrant,
but nice try Trumpie)