Khizr Khan has not provided any proof to support his claim that the U.S. government is reviewing his travel privileges.
You may remember Khan from his heartfelt speech at the Democratic National Convention.
"Let me ask you: Have you even read the United States Constitution?" Khan said directly to Donald Trump from the DNC podium. "I will gladly lend you my copy."
Khan made a lasting impact when he spoke about his son, Humayun Khan, who was killed in action in 2004 while on tour in Iraq. Khan used his platform at the DNC to speak directly to Trump, who was then the presumptive Republican nominee for president, asking what he had sacrificed for the country.
He also questioned Trump's opinion of Muslims and other minority groups. Khan made several appearances on television news shows and political ads, cementing himself as an outspoken critic of Trump, his policies and his administration.
Also on Monday, President Trump privately signed a more narrowly written executive order to replace the travel ban currently tied up in the courts. This new order highlights six Muslim-majority countries barred from open travel to the U.S. It doesn't list Iraq, which was included in the original travel ban.
Khan has since been unreachable or unwilling to give more information about the situation. And that's led to questions about the truthfulness of his story.
Khan was born in Pakistan but has been a U.S. citizen for more than three decades.