Speaking on Fox News earlier today, John McCain made the same mistake as Janet Napolitano did a few days ago. In an attempt to defend her, McCain said:

"Well, some of the 9-11 hijackers did come through Canada, as you know."

The Canadian ambassador corrected him as he had done with Napolitano:

"As the 9-11 Commission reported in July 2004, all of the 9-11 terrorists arrived in the U.S. from outside North America. They flew to major U.S. airports. They entered the U.S. with documents issued to them by the U.S. government. No 9-11 terrorists came from Canada."