JUDY WOODRUFF: We should start praying. I wouldn't be surprised if half of these loans went down" - that's what a trader at Citigroup wrote in an e-mail in 2007, after reviewing thousands of mortgages bought and sold by the bank. Today, the Justice Department cited those very words as it announced a $7 billion settlement with the bank. The government said Citi committed egregious misconduct in the lead-up to the financial crisis. Of the $7 billion, Citigroup will pay $4 billion to the Justice Department. More than $2.5 billion is set aside for what's described as consumer relief. Tony West is associate attorney general. And he was the government's lead negotiator in this case. Lay out for us, what was this egregious conduct and how many people at Citigroup were engaged in it? TONY WEST: Citibank packaged securities, packaged loans, mortgage loans into these securities, which they sold to investors. What they didn't tell investors was what the actual quality of those loans were. And so you had these mortgage bond deals that had quality that was far less than what Citi was representing to investors that they were. JUDY WOODRUFF: And how many people knew about this, and did the knowledge go all the way to the top? TONY WEST: We know from the evidence that bankers were warned that the quality of the loans that they were packaging into these securities wasn't what they were telling investors they were, but they ignored those warning signs. They ignored that due diligence. Certainly enough ... bankers knew that we felt that we could demand a very high, in fact, an historically high, penalty from Citibank.