Asap Rocky and his entourage get in to an altercation with locals in Sweden after one of them claims his headphones got smashed.
The musician, real name Rakim Myers, has been charged with assault causing actual bodily harm in Stockholm. He will remain in custody until a trial takes place.
Mr Trump said on Twitter that Sweden had "let our African American community down".
- ASAP was arrested on 3 July following a fight that was captured on video. Two other men who were with them at the time have also been charged with assault. The musician says that his group was being followed by a group of men and he acted in self-defense. Donald Trump said last week that he had spoken to Swedish prime minister Stefan Lofven about ASAP's case.
However on Thursday the president wrote that he was "very disappointed" in Mr Lofven for being "unable to act" and urged him to "treat Americans fairly".