Brian Williams: I told the story correctly for years before I told it incorrectly

NBC News' Brian Williams claimed on Friday that he told the story of his time in Iraq correctly before telling it "incorrectly."

Matt Lauer: "Was it conscious, Brian? Because let's go back to January when you went on Nightly News and you recounted a story about a military veteran who played a role in a harrowing chopper ride you took while covering the Iraq war. And you told the story, you had told some versions of it in the past in other venues.

"Did you know it was not true?"

Williams: "I told the story correctly for years before I told it incorrectly.

"I was not trying to mislead people. That, to me, is a huge difference here."