This is part of a trend of suddenly deciding not to recognize Haudenosaunee passports. A group of Mohawks who went to Bolivia for an environmental conference were refused readmission to the US and Canada when travelling on their Haudensaunee passports:
no subject
Date: 2010-07-13 06:45 pm (UTC)http://kahnawakenews.com/clients/kahnawakenews/canada-prevents-mohawks-from-returning-home-on-haudenosaunee-passports-p798.htm?twindow=Default&smenu=1&mad=No
So I suspect it's part of a larger campaign to continue to delegitimize Native/Indigenous sovereignty.