That would be the US Congress, who is a day late and a dollar short, because Canada apologized in JANUARY. Whatevuh.
Arar thanked the Congressmembers by video link because, even though an investigation has cleared him of any terrorist connections, he is still on a watch list and not allowed into the United States. The Bush administration has never apologized to Arar and is working to block his lawsuit against the US government. However, now Congressmen of both parties, even some like Rep. Dana Rohrabacher (R-CA) who still support the practice of rendition, have come together to acknowledge the wrong that was committed.
The following video is from CNN's American Morning, broadcast on October 19, 2007.