A large billboard stands on top of a Nike store showing former San Francisco 49ers quarterback Colin Kaepernick at Union Square, Wednesday, Sept. 5, 2018, in San Francisco. An endorsement deal between Nike and Colin Kaepernick prompted a flood of debate Tuesday as sports fans reacted to the apparel giant backing an athlete known mainly for starting a wave of protests among NFL players of police brutality, racial inequality and other social issues. (AP Photo/Eric Risberg)