Colin Kaepernick: Quarterback says he has received death threats

Photos: NFL players protest during national anthem
Colin Kaepernick (right) and Eric Reid of the San Francisco 49ers kneel in protest during the national anthem on September 12, 2016, in Santa Clara, California.
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Photos: NFL players protest during national anthem
Seattle Seahawks' Jeremy Lane sits as the national anthem plays before a preseason match against the Oakland Raiders on September 1, 2016, in Oakland.
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Photos: NFL players protest during national anthem
Kenny Britt and Robert Quinn of the Los Angeles Rams raise their fists prior to playing the San Francisco 49ers on September 12, 2016, in Santa Clara.
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