Serena Williams reiterated her admiration for American football player turned activist Colin Kaepernick on Tuesday, and praised apparel maker Nike for featuring him in a new ad campaign. ‘Especially proud to be a part of the Nike family today. #justdoit,’ the 23-time Grand Slam champion tweeted before she headed out to book a US Open semi-final berth with a 6-4, 6-3 victory over Karolina Pliskova. The ads prompted immediate calls for Nike boycotts over Kaepernick, who has been castigated by President Donald Trump and other conservatives for kneeling during the national anthem to protest racial and social injustice, a demonstration he began in 2016.
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