OTTAWA—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.

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“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.”

It’s not clear what “review” Khan was referring to. While the Trump administration continues to try to implement a travel ban for citizens from six Muslim-majority countries and deport illegal immigrants, neither initiative would apply to Khan, who became a U.S. citizen in 1986.

The State Department issued a brief statement Monday saying that any U.S. citizen with a valid passport can enter or leave the country. Khan, Ramsay, and the U.S. Immigration and Customs Enforcement agency did not return requests for comment.

Khan was scheduled to appear at a luncheon and Q&A session Wednesday, focusing on what he calls “a message of unity and equality before the law.”

Khan rose to national prominence in 2016 when he gave a speech at the Democratic National Convention, and has been a harsh critic of the Trump administration’s ban on immigrants from Muslim countries.

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Khan’s son, Capt. Humayan Khan, was killed in a suicide-bombing attack in Iraq in 2004. He was posthumously awarded the Purple Heart, and is credited for saving his troops from the bomber.

Speaking with the Star last week, Khan said he has had several international requests since his speech at the Democratic convention.

“I get offers outside the U.S. I have invitations to go to Sweden, Germany, Oxford. Japan television has been four times to our home,” Khan said.

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When asked if he was concerned for his safety, Khan said he intends to continue to speak out.

“We have taken precautions and we are very, very careful,” Khan said. “But we have to take some risks.”

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