Australia’s decision to cancel tennis star Novak Djokovic’s visa for a second time was driven by fear that letting him stay could foster antivaccine sentiment during a surge in Covid-19 cases, court documents show.

Immigration minister Alex Hawke didn’t dispute Djokovic’s claim of a medical exemption from rules that travelers to Australia must be vaccinated against Covid-19, according to documents made public Saturday. Hawke, who canceled Djokovic’s visa on Friday, said allowing the player to stay could sway some Australians against getting vaccinated.

“Mr. Djokovic’s presence in Australia may pose a health risk to the Australian community in that his presence in Australia may foster antivaccination sentiment,” Hawke said in a document detailing his decision.