Colin Kaepernick has become the face of Nike's "Just Do It" ad campaign as the company celebrates the 30th anniversary of the slogan, ESPN's Darren Rovell reports.

Why it matters: Kaepernick is one of the most polarizing figures in sports. The former San Francisco 49ers quarterback has not played in the NFL since 2016, and is currently suing league owners for blackballing him because of his protests against racial inequality in the United States.