Khizr Khan, the Muslim father of a U.S. Army captain killed in Iraq in 2004, will campaign with Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE on Sunday night, a campaign aide told The Hill.

Khan will appear with Clinton during a rally in Manchester, N.H., his first appearance alongside the former secretary of State on the campaign trail.

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The Gold Star father was thrown into the national spotlight after he gave a speech at the Democratic National Convention in July, denouncing Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE.

During the speech he pulled a pocket-sized copy of the Constitution from his pocket and offered to let Trump borrow it.

Since then, Khan has appeared in a Clinton campaign ad and has blasted Trump in media interviews. He campaigned for Democrats in Virginia on Friday.

Singer James Taylor is also scheduled to perform at the Sunday night rally.