I've made a lot of sacrifices: Trump

US Republican presidential nominee Donald Trump on Saturday rejected a Muslim lawyer's assertion on the Democratic convention stage that the businessman-turned-politician has "sacrificed nothing and no one" for the country.

In an interview with ABC News' George Stephanopoulos, Trump asked, "Who wrote that? Did Hillary's script writers write it?"

"I think I've made a lot of sacrifices. I work very, very hard," he added.

On the last night of the Democratic National Convention on Thursday, a bereaved father Khizr Khan, his wife Ghazala by his side, recounted to the crowd how his son was killed in 2004 by a car bomb in Iraq.

Khan also chastised Trump for seeking to ban Muslims from entering the country, saying that his son, US Army Capt. Humayun Khan, would not have been able to serve under a Trump presidency.

"Go look at the graves of brave patriots who died defending the United States of America," Khan said, addressing Trump. "You will see all faiths, genders and ethnicities. You have sacrificed nothing and no one."

Trump also suggested that Khan's wife didn't speak because she was forbidden to as a Muslim.

"If you look at his wife, she was standing there. She had nothing to say. She probably, maybe she wasn't allowed to have anything to say. You tell me," he said in the interview to ABC News.

Trump said: "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. I've had tremendous success. I think I've done a lot."

Trump also cited his work on behalf of veterans, including helping to build a Vietnam War memorial in Manhattan, and raising "millions of dollars" for vets.