Pink sings the US national anthem before the start of the Super Bowl in Minneapolis on Sunday. Pic/AFP

American singer, songwriter Pink slammed trolls which criticised her performance of the national anthem at the beginning of the Super Bowl in Minneapolis on Sunday. One user tweeted: "Beautiful Trauma singer sucks." "Yeah but at least I s**k while singing our countries national anthem, and you just suck by yourself on a dirty couch. #winning," she replied. Critics hit out at her for spitting out what appeared to be gum during her performance. "It was a throat lozenge," replied Pink, who revealed that she was down with a flu on the eve of her show.