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WATCH: Carl Bernstein on covering King's 'dream' speech

Carl Bernstein saw Martin Luther King Jr. deliver his "I have a dream" 50 years ago.

Carl Bernstein saw Martin Luther King Jr. deliver his "I have a dream" 50 years ago.

"It was the greatest moment I have experienced as an American,” he said on Wednesday's Morning Joe, recalling covering the event for the Washington Star.

"Nobody I think actually quite understood the gravity of what he was saying, the gravity of the moment," he said. "This was a moment in American history when black, white, unions, people of good will, came together including some great Southern whites and said 'this is enough.'"

Watch the full interview with Bernstein here.