Sen. Mitt Romney, R-Utah, marched with protesters in Washington, D.C., on Sunday over the death of George Floyd.
Romney can be seen in a video walking down a street with protesters wearing a mask.
"We need a voice against racism, we need many voices against racism and against brutality. And we need to stand up and say black lives matter," he told an NBC reporter.
Romney announced his appearance on Twitter, writing, "Black Lives Matter."
President Donald Trump has urged governors to activate the National Guard to "dominate" protesters. On May 29, he also tweeted, "when the looting starts, the shooting starts."
On Saturday, Romney tweeted a photo of his father marching in the 1960s.
"No Americans should fear enmity and harm from those sworn to protect us," he wrote. "The death of George Floyd must not be in vain: Our shock and outrage must grow into collective determination to extinguish forever such racist abuse."