Khizr Khan has one more question for Donald Trump.

The father of Humayun Khan, a Muslim-American soldier killed in Iraq in 2004, thrust himself into the election spotlight this summer at the Democratic National Convention, when he asked if the Republican nominee had even read the U.S. Constitution and told Trump he had "sacrificed nothing and no one."

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On Friday, Hillary Clinton’s campaign released an ad starring the Gold Star father. Khan comforts his wife Ghazala while he softly recites his question as footage of his son being laid to rest in Arlington National Cemetery plays on a nearby screen.

“I want to ask Mr. Trump, would my son have a place in your America?," Khizr Khan says in the ad titled “Captain Khan” after an image of Trump plays.

Clinton frequently mentions the Khans, who live in Virginia, on the campaign trail. She invoked their names again during the final presidential debate as an example of the list of people Trump has attacked during his campaign.

After the convention speech, Trump lashed out at the family, a move his fellow Republicans strongly criticized. At times, the feud has reignited as the Khans make their media rounds.

“Mr. Khan, who does not know me, viciously attacked me from the stage of the DNC and is now all over T.V. doing the same - Nice!” Trump tweeted as the couple spoke on CNN’s “New Day in August.