Gold Star father and outspoken President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE critic Khizr Khan on Monday canceled a planned speech in Canada as questions about the circumstances swirled.

Ramsay Talks, the organization planning to host Khan Tuesday for his scheduled speech in Toronto, issued the following statement to CTV News, which first reported the story.

“Late Sunday evening Khizr Khan, an American citizen for over 30 years, was notified that his travel privileges are being reviewed. As a consequence, Mr. Khan will not be traveling to Toronto on March 7th to speak about tolerance, understanding, unity and the rule of law. Very regretfully, Ramsay Talks must cancel its luncheon with Mr. Khan. Guests will be given full refunds,” the statement, which was also posted on Facebook, reads.

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“Mr. Khan offered his sincere apologies to all those who made plans to attend on March 7th. He said: ‘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. I am grateful for your support and look forward to visiting Toronto in the near future.’”

It is unclear what the statement means by “travel privileges.” As an American citizen, Khan legally has the right to travel abroad without issue.

Khan offered no comment when contacted by The Hill. Ramsay Talks did not provide an immediate comment when asked to elaborate and clarify the circumstances surrounding the event's cancellation.

The event, scheduled to be a luncheon that required attendees to pay, was to focus on “the appalling turn of events in Washington — so that we don't all end up sacrificing everything,” according to an event description.

Khan has been a vocal critic of the president, and some of those criticisms were quoted in the event listing.

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"Donald Trump consistently smears the character of Muslims, he disrespects minorities, women, judges, even his own party leadership," Khan told The Star, a Toronto-based news publication, late last week.

"He wants to build walls and ban us from this country," Khan continued.

Khan first made national headlines when he appeared at the Democratic National Convention and blasted Trump, memorably asking if the GOP candidate had read the Constitution while holding up a pocket-sized version of the document.

Khan’s son, Humayun Khan, was killed in 2004 while serving in Iraq. He was awarded the Purple Heart and Bronze Star medals posthumously.