Story highlights Khizr Khan is the father of fallen soldier Army Capt. Humayun Khan

He appears in a new ad for Hillary Clinton slamming Donald Trump

(CNN) An emotional Khizr Khan asks Donald Trump in a new Clinton campaign ad whether his son, a US solider who was killed in Iraq in 2004, would "have a place in your America?"

The ad is part of Clinton's closing message, one that her top aides hope will be uplifting and hopeful, offering an implicit contrast to the combativeness that the Trump campaign has turned to in recent weeks.

Khan, who was thrust into the national spotlight after he excoriated Trump in a speech at the Democratic National Convention, is seen at his home in the ad, looking at keepsakes from his son, Army Capt. Humayun Khan's, life.

"In 2004, my son was stationed in Iraq. He saw a suicide bomber approaching his camp. My son moved forward to stop the bomber when the bomb exploded. He saved everyone in his unit. Only one American soldier died," Khan says as video shows the father holding the flag that was draped over his son's casket.

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