 Complete the following phrase:  Protests against police brutality and racism by kneeling on one knee during the national anthem began in the National Football League after San Francisco 49ers quarterback Colin Kaepernick knelt during the anthem, as opposed to the tradition of standing, in response to police brutality in the United States, before his teams third preseason game of 2016. Kaepernick sat during the first two preseason games, but he went unnoticed. In particular, protests focus on the discussion of slavery and mercenaries in the third verse of the anthem, in which some have interpreted the lyrics as condemning slaves that had joined the British in an effort to earn their freedom. Since Kaepernicks protest, other athletes have joined in the protests. In the 2017 season, after President Donald Trumps condemnation of the kneeling, which included calling for complacent players whom he reportedly also referred to by various profanities to be fired, many NFL players responded by protesting during the national anthem that week. After the 