Nike has faced some backlash since debuting its powerful new ad campaign featuring Colin Kaepernick over the weekend, but one person coming to the apparel giant’s defense is none other than Serena Williams. The tennis star tweeted a picture from her own Nike campaign alongside a caption that read, “It’s only a crazy dream until you do it,” adding that she’s “especially proud to be a part of the Nike family today.”

Since making Kaepernick the face of its 30th-anniversary “Just Do It” campaign, there have been calls in Conservative corners to boycott Nike for promoting the man who effectively launched anthem protests in the NFL.

But Williams hasn’t shied away from publicly supporting Kaepernick or his teammate, Eric Reid, who also played a huge role in launching the anthem protests and drawing attention to racism. “I think every athlete, every human, and definitely every African American should be completely grateful and honored how Colin and Eric are doing so much more for the greater good, so to say,” Williams told The Associated Press on Friday, following her victory over sister Venus Williams in the 2018 U.S. Open. “They really use their platform in ways that is really unfathomable. I feel like they obviously have great respect from a lot of their peers, especially other athletes, people that really are looking for social change.” Both Kaepernick and Reid were in attendance at the match.

Williams isn’t the only athlete supporting Kaepernick and Nike. LeBron James, who’s also part of the Nike family, also shared the ad on Instagram.