The father of a U.S. soldier killed in Iraq has cancelled a speech planned for Toronto on Tuesday, with the event organizer suggesting Khizr Khan was concerned about travelling outside the United States.

In an email to ticket holders on Monday, organizer Bob Ramsay said Khan was "notified that his travel privilege (sic) are being reviewed" Sunday evening.

"This turn of events is not just of deep concern to me, but to all my fellow Americans who cherish our freedom to travel abroad," Khan said, according to Ramsay's statement.

"I have not been given any reason as to why."

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