PITTSBURGH (KDKA) — A Muslim-American father made headlines during last week’s Democratic National Convention, discussing the loss of his son and questioning Donald Trump’s proposed ban of Muslims entering the country.

Trump fired back over the weekend.

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KDKA’s political editor Jon Delano got a reaction from Hillary Clinton.

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When Delano met with Clinton and her running mate, Tim Kaine, Saturday night, he asked her about Khizr Khan’s address to the Democratic Convention.

“It just brought tears to my eyes,” Clinton said.

Khan and his wife, Muslim immigrants, lost their son, a U.S. Army captain, and Khan directly questioned Donald Trump for his proposed temporary ban of Muslims entering the country.

“Let me ask you, have you even read the United States Constitution?” Khan said at the convention. “I will gladly lend you my copy.”

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“I had known about this story. I had heard about it,” Clinton said. “I actually had talked about it some months back.”

Clinton acknowledged knowing the Khan story in advance and being moved by it.

“Jon, I too, like so many millions of Americans, was so moved by Mr. Khan, and Mrs. Khan standing there, while Mr. Khan talked about his son, Captain Khan, who sacrificed his life to save the members of his unit,” she said.

Khan told Trump to visit Arlington Cemetery to see the gravesites of American heroes of all faiths and added, “You have sacrificed nothing and no one.”

On Sunday morning, Trump tweeted that he was, “viciously attacked by Mr. Khan,” adding, “I think I’ve made a lot of sacrifices. I work very, very hard. I’ve created thousands and thousands of jobs, tens of thousands of jobs, built great structures.”

But Clinton told Delano that the Khans should not be criticized for feeling their loss so deeply.

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“We talk a lot about patriotism,” she said. “We throw the word around, but those people who have lost loved ones in service to our country are the ones who are the most moving to me because it’s not idle talk. It’s deeply rooted in both their loss and their pride.”