NBA superstar Enes Kanter of the Boston Celtics has issued an invitation to Nike owner Phil Knight to travel with him to China to see where and how his companies sneakers are made. Kanter also invited LeBron James and Michael Jordan, both of whom have signature sneakers with the footwear giant.

In his invitation, posted to Twitter, he shows off his own Nikes, which are covered with red splashes of paint that look like blood, and the words “made with slave labor,” “no more excuses,” “modern day slavery,” and “hypocrite Nike.”

Kanter also called out the leader of the Chinese Communist Party, President Xi Jinping, for the forced slave labor of the Uyghur Muslim minority over the weekend. He demanded that Jinping “close down the slave labor camps” and “stop the genocide now.”

LeBron James, who has cemented himself as an outspoken advocate for leftist causes in the US, has not voiced opposition to the Chinese nation’s enslavement of the Uyghur minority, or the horrifying labor conditions in the camps and factories where these people are forced to work.