The 9-year-old granddaughter of Martin Luther King Jr. made a rousing appearance at a huge protest for gun control in Washington on Saturday, saying that like the slain civil rights leader she too has a dream -- "a gun-free world."

The poised young girl made a surprise appearance at the "March For Our Lives" rally, held near the National Mall where her grandfather delivered his "I Have a Dream" speech calling for an end to racism in the United States in August 1963.

"My grandfather had a dream that his four little children will not be judged by the color of their skin but by the content of their character," Yolanda Renee King told the crowd.

"I have a dream that enough is enough," she said. "And that this should be a gun-free world -- period."

She then led the rapt crowd in a chant. "Spread the word have you heard, all across the nation, we are going to be a great generation," she said.

