#TakeAKnee, football players and artists kneel against social injustice in the US

#TakeAKnee, football players kneel against social injustice in the US

J.J. Watt #99 of the Houston Texans kneels before a game against the New England Patriots at Gillette Stadium on September 24, 2017 in Foxboro, Massachusetts © Maddie Meyer/Getty Images

#TakeAKnee, football players kneel against social injustice in the US

Members of the New England Patriots kneel on the sidelines during the national anthem before a game against the Houston Texans on September 24, 2017 in Foxboro, Massachusetts © Maddie Meyer/Getty Images

#TakeAKnee, football players kneel against social injustice in the US

Members of the Detroit Lions take a knee during the playing of the national anthem prior to the start of the game against the Atlanta Falcons on September 24, 2017 in Detroit, Michigan © Rey Del Rio/Getty Images

#TakeAKnee, football players kneel against social injustice in the US

Members of the Detroit Lions take a knee during the playing of the national anthem prior to the start of the game against the Atlanta Falcons on September 24, 2017 in Detroit, Michigan © Rey Del Rio/Getty Images

#TakeAKnee, football players kneel against social injustice in the US

Members of the Atlanta Falcons football team take a knee during the playing of the national anthem prior to the start of the game against the Detroit Lions on September 24, 2017 in Detroit, Michigan © Leon Halip/Getty Images

#TakeAKnee, football players kneel against social injustice in the US

Justin Houston #50 of the Kansas City Chiefs takes a knee during the national anthem before the game against the Los Angeles Chargers on September 24, 2017 in Carson, California © Sean M. Haffey/Getty Images

#TakeAKnee, football players kneel against social injustice in the US

Players of the Kansas City Chiefs take a knee before the game against the Los Angeles Chargers on September 24, 2017 in Carson, California © Sean M. Haffey/Getty Images

#TakeAKnee, football players kneel against social injustice in the US

Tampa Bay Buccaneers players take a knee during the national anthem before the game against the Minnesota Vikings on September 24, 2017 in Minneapolis, Minnesota © Hannah Foslien/Getty Images