Khizr Khan, 66, father of Army Capt. Humayun Khan, hit the campaign trail for the first time along with Hillary Clinton to make an emotional endorsement of the Democratic nominee.
"Donald Trump, would my son, Capt. Humayun Khan, have a place in your America? Would Muslims have a place in your America? Would Latinos have a place in your America? Would African Americans have a place in your America? Would anyone who isn't like you have a place in your America?" he asked.
"And on Tuesday we are going to prove America belongs to all of us," said Khan, who has emerged as a national hero particularly among Muslim Americans after his July speech in the Democratic National Convention.
While posthumously receiving a Bronze Star and a Purple Heart for his son after he was killed by a suicide bomber in Iraq in 2004, Khan had stunned a national audience when he directly confronted the controversial real estate tycoon, saying Trump "has sacrificed nothing and no one".
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In Manchester, he introduced Clinton - who has lashed out on several occasions against Trump for insulting Khan and his family - as someone who would"preserve fundamental American values".
He said that in Clinton, people see a leader who is fighting for the true values of this country, which are "under attack" by Trump in this election.
When Clinton took the podium, she thanked Khan for his support and made a nod toward the difficult task of mending fences after a divisive presidential campaign.
"We will have some work to do to bring about healing and reconciliation after this election," she said.
Vowing to be a president for all Americans, Clinton said the idea that the US is "hopeful, inclusive, big-hearted, united" is one of the most fundamental values.
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Khan said: "On one hand, we have Donald Trump and his policies of hate, exclusion, intimidation and division. He challenges the impartiality of our justice system. His shameful disrespect of women has been embarrassing for America to watch.
"On the other hand, we have Hillary Rodham Clinton, with her lifelong public service to this country. She is the strongest, most qualified representative of the fundamental values which have made this country a symbol of hope and dignity for all throughout the world."
Clinton also reiterated her commitment to build an economy that works for everyone, not just those at the top, to help all kids get the chance to thrive with good schools and good teachers.