A number of assumptions have been made about the nature of the allegations against Omar, the strength of the evidence in the murder charge, and so forth, that have informed the U.S. government's position thus far. In light of the evidence that's come out in the last several months, one would hope that they would be more amenable to a resolution of the case.
Each one of these transfers that have been negotiated from Guantánamo Bay has been a little bit different, depending upon the political circumstances and the relationship with the country in question. With the British detainees, for example, the promise was to investigate--to afford due process, basically. If there was a basis for charges, then the British government would pursue charges. With respect to the British citizens who were returned to the United Kingdom, my understanding is that the process resulted in almost immediate release, because when they looked at the evidence that was available, there was no basis on which to prosecute.
So I don't know that the U.S. government could demand that the Canadian government do anything more than simply follow its law and afford Omar appropriate process under that law.