I see one other post claiming a McGill acceptance in the political theory subfield. My decision did come a lot earlier than I expected, especially given the school's Jan 15 deadline, so I'm not sure if there will be more to come.
Like most universities, there's a preference for domestic students. However, just looking at the current PhD students listed on their website, there's fairly sizeable representation of international students from all over, so I wouldn't write it off, especially if you see a fit with the department.