MANCHESTER, N.H. — In a call and response with voters here on Sunday night, Khizr Khan, the father of a soldier killed in Iraq, portrayed a dark vision of the country if Donald J. Trump were to win Tuesday’s presidential election.

“I have a few questions for you, Donald Trump,” Mr. Khan said as he introduced Hillary Clinton.

“Donald Trump, would my son Captain Humayun Khan have a place in your America?”

A scattering of attendees responded, “No.”

“Would Muslims have a place in your America?”

The answer grew louder: “No.”

“Would Latinos have a place in your America?”

“No,” the audience erupted.

“Would African-Americans have a place in your America?”