Romney, who represents Utah, posted a tweet showing him wearing a mask as he walked with Black Lives Matter protesters in Washington.
On Saturday, Romney tweeted a photo of his father, George, who was the governor of Michigan from 1963 to 1969, marching with civil rights protesters in the 1960s in a Detroit suburb.
Above the photo, Mitt Romney wrote: “This is my father, George Romney, participating in a Civil Rights march in the Detroit suburbs during the late 1960s — “Force alone will not eliminate riots,” he said.
Romney also wrote two other tweets on May 30 and May 28 criticising the Minneapolis officers involved in the death of George Floyd.
The May 30 tweet said: “The George Floyd murder is abhorrent.