Passport-facebook access req object from within callback function

On the callback from Facebook for nodejs passport authentication, how do you get the req object within the callback?

passport.use(new FacebookStrategy({
    clientID: 123456789,
    clientSecret: 'SECRET',
    callbackURL: "http://example.com/login/facebook/callback"
  },
  function(accessToken, refreshToken, profile, done){
    // Is there any way to get the req object in here?
  }
));