The Twitter account of the Boston Celtics posted, and then quickly deleted, an image of star player Kemba Walker wearing a “Don’t Tread on Me” Gadsden flag shirt.

The tweet was posted just prior to the Celtics game, showing Walker arriving at the arena in a yellow hat, green and yellow shoes, and a shirt with a “Don’t Tread on Me” Gadsden flag image prominently displayed on the back. The team deleted the tweet after facing backlash on social media.