Via CBC:

The father of a fallen U.S. army captain who made headlines during the American election campaign for taking on Republican candidate Donald Trump has cancelled a talk he was set to deliver in Toronto after being notified that his travel privileges are under review, organizers say.

Pakistan-born Khizr Khan, who famously offered up his copy of the U.S. Constitution to the billionaire presidential hopeful who vowed to implement a ban on Muslims entering the U.S., was scheduled to speak at a luncheon hosted by Ramsay Inc. on Tuesday.

But on Monday, organizers of the luncheon issued a statement saying that Khan would not be travelling to Toronto.

“Late Sunday evening Khizr Khan, an American citizen for over 30 years, was notified that his travel privileges are being reviewed,” Julia McDowell of Ramsay Inc. said.

The statement goes on to quote Khan, saying he offered his sincere apologies for the cancellation.

“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. I have not been given any reason as to why,” the statement quotes Khan as saying.

CBC News reached out to Khan’s law office directly, which said in an email it had no comment.

As upyernoz — someone who knows a lot about immigration law — points out, U.S. citizens aren’t supposed to have “travel privileges” that can be revoked by the government.  Your U.S. citizenship is not subject to the whims of whoever is in charge of the executive branch or the department heads underneath him.

At least that’s the way it’s supposed to work in a democracy.