The 19 hijackers that came over here to commit the attack on Sept. 11, there were those that were at the bottom of the line. There were those who were the principal conspirators. There were those who were the pilot. Everybody has a role.

Secondly, not only have we put additional agents on counterterrorism, but we've also built up our analytical structure so that we're better positioned to analyze the information we have.

The FBI's principal priority right now is protecting the United States against another terrorist attack.

Robert Mueller Quotes