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Khizr Khan, the father of fallen Army Capt. Humayun Khan, speaks at a rally for Democratic presidential candidate Hillary Clinton in a file photo. (Andrew Harnik | AP Photo)

Khizr Khan, the Gold Star father who memorably clashed with Donald Trump during last year's presidential campaign, cancelled a speech in Toronto after being told his freedom to travel abroad was placed under review.

Khan was scheduled to speak at a luncheon in Toronto on Tuesday on the political situation in the United States, according to Politico. Ramsay Talks, which organized the luncheon, said in a Facebook post that Khan cancelled after being notified his travel privileges were under review.

KHIZR KHAN EVENT CANCELLATION Late Sunday evening Khizr Khan, an American citizen for over 30 years, was notified that... Posted by RamsayTalks on Monday, March 6, 2017

The news was first reported by CTV News in Canada.

Khan released a statement through Ramsay Talks.

"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 in the statement, according to Politico. "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."

Tuesday's event was to include a presentation and question-and-answer session. Tickets were priced at about $100, Politico said.

Khan criticized Trump during a speech at the Democratic National Convention last year, telling the candidate that he had sacrificed nothing. He asked if Trump had even read the Constitution while holding up a pocket-sized copy.

Trump later criticized Khan and his wife on Twitter and in media interviews.

Khan has been a U.S. citizen for over 30 years, Politico said. His son, Humayun Khan, a University of Virginia graduate and Muslim American Army captain, died in Iraq in 2004.

He was posthumously awarded a Bronze Star and Purple Heart.

Khan immigrated to the United States from Pakistan.