I have two things to say in response. The information that's involved here is the basic information on page 2 of your passport. In other words, it's not intrusive information. It is what people call “tombstone” details of identification, as well as the date of crossing. It's not information that you wouldn't present to the American authorities when crossing the border—nothing beyond what they require when you enter their country, or vice versa.
Secondly, we have gone through the details of the process with the Office of the Privacy Commissioner. We sought the advice of the Privacy Commissioner every step of the way in structuring the arrangement. We wanted to ensure that we could respond to their advice and their questions and satisfy the Privacy Commissioner that this was being handled in a way that was respectful of the privacy of Canadians.