Race Imboden, an Olympic medalist and part of the men’s foil team that won gold at the Pan American Games, wrote on Twitter that he was honored to represent Team USA at the event, but his pride was “cut short” by “shortcomings” of his country.

“Racism, Gun Control, mistreatment of immigrants, and a president who spreads hate are at the top of a long list,” he wrote in a series of tweets. “I chose to [sacrifice] my moment today at the top of the podium to call attention to issues that I believe need to be addressed. I encourage others to please use your platforms for empowerment and change.”