2 players kneel during anthem on NFL opening Sunday, Kaepernick tweets thanks

Albert Wilson #15 and Kenny Stills #10 of the Miami Dolphins sit during the National Anthem against the Tennessee Titans at Hard Rock Stadium on September 9, 2018 in Miami, Florida. (Photo by Mark Brown/Getty Images)

Colin Kaepernick called them his brothers.

Dolphins teammates Kenny Stills and Albert Wilson were the only two players to kneel during the national anthem on the NFL's opening Sunday, and Kaepernick, who is no longer welcome on an NFL sideline, made sure to offer his thanks to them via social media .

"My Brothers (Stills) and (Wilson) continue to show their unwavering strength by fighting for the oppressed," Kapernick said in his tweet. "They have not backed down, even when attacked and intimidated. ... Love is at the root of our resistance."

It was Kaepernick, then with the 49ers, who sparked the anthem controversy by kneeling during the pregame ritual in 2016 — his way of protesting police brutality and social injustice in America.

Since opting out of his contract after that season, Kaepernick has been unable to land a job with an NFL team and is suing the league for collusion.

But his voice is still being heard. Last week, Nike introduced an ad featuring the quarterback and his message: "Believe in something, even if it means sacrificing everything."

While Stills and Wilson were kneeling during the anthem, teammate Robert Quinn raised his fist. Niners receiver Marquise Goodwin did the same at San Francisco's game at Minnesota. In Los Angeles, Chargers left tackle Russell Okung raised his fist. Broncos receiver Demaryius Thomas and linebacker Brandon Marshall, and Seahawks linemen Duane Brown and Quinton Jefferson, retreated to their respective tunnels while the anthem played.

On most weeks last year, the Seahawks had the most players taking action during the anthem. Though that number had fallen to 2 to start 2018, Brown wasn't worried.

"I made my decision. That was my decision," he said. "I wasn't paying attention to see what other teams or other players are doing."

The NFL briefly had a policy in place in May regarding the anthem, but quickly rescinded it so the league and players union could negotiate. Brown said he hasn't heard any word from the union dissuading player protests during the anthem.

"I don't think that would be the best idea to try to get people to move on from it," he said. "The country hasn't moved on from it, so I'm not going to move on from it, either."

Among those keeping the issue front and center is President Donald Trump, who sent a tweet of his own several hours before Kaepernick's, taking digs at the NFL, and linking low ratings for Thursday night's opener between Atlanta and Philadelphia (lowest for an opener since 2008) to players who refuse to stand for the anthem.

"If the players stood proudly for our Flag and Anthem, and it is all shown on broadcast, maybe ratings could come back? Otherwise worse!" he tweeted.

CBS and Fox, which carried Sunday afternoon's games, have said they did not plan on televising the anthem.

However, NBC did show the anthem on Thursday night (but not before Sunday night's Bears-Packers game), and no players kneeled or protested in other ways.

That included Malcolm Jenkins of the Eagles, who raised his fist during the anthem last season but did not for the opener. During pregame warmups, he wore a shirt that read "Ca$h bail = poverty trap."

Jenkins, a founder of the Players Coalition which was formed to tackle issues similar to those Kaepernick is concerned about, said he would like to move the focus away from the anthem.

"I think there's a huge need for us to turn the attention to not only the issues, but what players are actually doing in their communities to promote change," he said. "We're trying to move past the rhetoric of what's right or what's wrong in terms of the anthem, and really focus on the systematic issues that are plaguing our communities."