In Toronto, organizers have canceled an event after learning that Khizr Khan, the father of a Muslim U.S. soldier who died in Iraq, was reportedly told his travel privileges are being reviewed. The event had been scheduled to take place today. The Gold Star father and his wife, Ghazala Khan, were verbally attacked by then-Republican presidential candidate Donald Trump over the summer, after the Khans took to the stage at the Democratic National Convention, where Khizr addressed Trump directly.

Khizr Khan: “Donald Trump, you’re asking Americans to trust you with their future. Let me ask you: Have you even read the United States Constitution? I will gladly lend you my copy.”

After this speech, Trump made fun of Ghazala Khan, suggesting she hadn’t spoken on stage because she wasn’t allowed to. Khan has lived in the U.S. since 1980, and both he and his wife are U.S. citizens. It’s not known which of his travel privileges might be under review. Their son, U.S. Army Captain Humayun Khan, was posthumously awarded the Bronze Star and Purple Heart after he was killed in Iraq in 2004.