Kaepernick, who is from Milwaukee, Wisconsin, has been compared to the likes of the boxer Muhammad Ali and Jesse Owens, the African American star of the 1936 "Nazi Olympics", in using his sporting prowess to draw attention to wider social issues.
Last night Nike unveiled a polarizing new ad as part of its 30th anniversary "Just Do It" campaign, which features free agent quarterback Colin Kaepernick along with the caption, "Believe in something".
Nike's deal also means that, though countless fans immediately pledged to boycott the brand ― even going so far as to light their shoes on fire (yes, really) ― they may find it hard to avoid all National Football League products entirely.
"Former marine. Get ready Nike, multiply that by millions", he wrote.
The morning following the announcement of Kaepernick's deal, Nike stocks fell almost three per cent, while Adidas and Puma stock fell 2.41 per cent and 1.83 per cent, respectively. The hashtags #BoycottNike and #JustBurnIt are trending.
An active Instagram user, Brady double-tapped the screen when he saw the account for GQ Magazine share the Nike ad, which features Kaepernick's face and includes the words, "Believe in something".
Under Armour faced criticism a year ago after its chief executive made comments supporting Trump, while Adidas drew calls in May to cut its ties to rapper Kanye West after he described slavery as a choice and praised Trump.
This is not the first time members of the public have protested against brands by destroying the goods they had previously purchased. Dozens of other players began joining Kaepernick, and he has become a symbol of the dividing lines over race in America. "Even though he is one of the best Quarterbacks in the league".
Nike's relationship with CK goes back almost 10 years.
"Nike is hoping that this will not cause a backlash to impact their sales", Doocy added in a later segment.
Some supported efforts to boycott the company.
"If you said that he was going to get seven figures, I wouldn't be surprised", said Joe Linta, the president of JL Sports, an agency that represents National Football League athletes, who described Kaepernick as a "lightning bolt" in the sports world.