The assassination of Charlie Kirk has rocked the country, and it's hit Donald Trump and his family especially hard ... POTUS and the influential activist were close friends.
#47's golf star granddaughter Kai Trump also spent a lot of time with Kirk ... and now she's opening up about the horrific incident.
"I am deeply saddened to hear the news about Charlie Kirk," the 18-year-old said on her Instagram story. "My heart goes out to his wife, Erika, and their two children.