Dave Matthews takes a knee alongside Stevie Wonder at Concert for Charlottesville

Dave Matthews on Sunday took a knee alongside Stevie Wonder during a Charlottesville concert following President Trump's attacks on NFL players who kneel during the national anthem.

Wonder came out to the stage with the Dave Matthews Band during "A Concert for Charlottesville," an event described as a night of "music and unity" after the violent clashes in Charlottesville, Va.

Wonder said during the event that Matthews was working to "spread the never-ending cry to love," according to Billboard.

He then shared the words to a song that hasn't yet been released: "Fear Can't Put Dreams to Sleep."

After that, Wonder took a knee. Matthews did the same.

"I take a knee for America and two knees in prayer for our world. Amen," Wonder said.

The action comes after President Trump last week attacked NFL players who kneel during the national anthem.

On Sunday, many players across the country knelt or locked arms during the national anthem in their first games since Trump's comments.

Trump on Monday continued to target NFL players, saying the issue of kneeling isn't about race, but is instead about respect for the country and its flag.

"NFL must respect this!" he tweeted.