News outlets are hedging their coverage of a claim by Khizr Khan, a star anti-Trump speaker at the Democratic National Convention, that he had to cancel a speech in Canada this week after being "notified" that his "travel privileges are being reviewed."

Khan, after being reached by multiple outlets including the Washington Post and NPR, has not provided any clarification about who "notified" him and what he meant by his "travel privileges" being "reviewed."

A story in the Post published Tuesday ran under the headline, "Khizr Khan's claim that the U.S. is restricting his travel may be unraveling."

The story said that "Khan has refused to elaborate on his initial statement to The Washington Post and other publications."

"Asked Khizr Khan several simple, clarifying [questions] via email," NPR reporter Domenico Montanaro said Monday on Twitter. "He got back, saying only 'Thank you - no comments.' I'd stay away from this story."

Khan, a naturalized U.S. citizen from Pakistan, made his initial claim in a statement on Monday. It was relayed through Ramsay Talks, which was hosting his speaking event.

"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," said Khan in the statement. "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."

Many outlets covering Khan's initial claim were careful to state that there were no legal indications that he would be prohibited from traveling abroad and reports were sure to state that this was merely a claim by Khan.

The Daily Mail, a popular British-based publication, however, wasn't as skeptical.

"A U.S. citizen whose son died while serving in Iraq has been forced to cancel a speech in Toronto after being warned his 'travel privileges are being reviewed' for an unknown reason," a report in the Mail said.

Khan, a Muslim American, gained national recognition for delivering a harsh rebuke of Trump on stage at the Democratic National Convention in July.

Then Republican-nominee Trump responded by suggesting that Khan's wife stood by silent during the speech because she "wasn't allowed allowed to have anything to say," likely a reference to her religion.

Khan's claims that his travel rights were "under review" coincided with the Trump administration's executive order restricting travel into the U.S. from some Muslim-majority countries.