The mother of a dead US Muslim soldier has hit back at presidential hopeful Donald Trump for questioning her silence during a speech by her husband.
Ghazala Khan said Mr Trump was ignorant about Islam and that he did not know the meaning of the word sacrifice.
Her husband Khizr Khan attacked the Republican nominee in an emotional speech to the Democratic National Convention on Thursday.
Mr Trump later suggested Mrs Khan may not have been allowed to speak.
The couple’s son, US Army Capt Humayun Khan, was killed by a car bomb in 2004 in Iraq at the age of 27.
In an opinion article for the Washington Post, Mrs Khan said her husband had asked her if she wanted to speak at the convention but she had been too upset.
“Walking on to the convention stage, with a huge picture of my son behind me, I could hardly control myself. What mother could? Donald Trump has children whom he loves. Does he really need to wonder why I did not speak?” she wrote.
She added: “Donald Trump said he has made a lot of sacrifices. He doesn’t know what the word sacrifice means.”
On Monday, family members of eleven service-members killed in action wrote to Mr Trump, expressing dismay at his treatment of the family of Humayun Khan, and demanding an apology.
“When you question a mother’s pain, by implying that her religion, not her grief, kept her from addressing an arena of people, you are attacking us. When you say your job building buildings is akin to our sacrifice, you are attacking our sacrifice,” their letter said.
“This goes beyond politics. It is about a sense of decency. That kind decency you mock as ‘political correctness’,” it went on to say.
At the convention in Philadelphia, Pakistani-born Khizr Khan said his son would not even have been in America if it had been up to Mr Trump, who has called for a ban on Muslims entering the US.
Responding to the criticism, Mr Trump said in an interview with ABC’s This Week: “If you look at his wife, she was standing there.
“She had nothing to say… Maybe she wasn’t allowed to have anything to say. You tell me.”
Mr Trump also defended himself from Mr Khan’s criticism.
“While I feel deeply for the loss of his son, Mr Khan, who has never met me, has no right to stand in front of millions of people and claim I have never read the Constitution, (which is false) and say many other inaccurate things,” he said.
But Mr Trump’s remarks drew condemnation from both Democrats and Republicans.
Democratic presidential candidate Hillary Clinton attacked Trump’s treatment of the Khans during a campaign stop at a church in Cleveland, Ohio.
“Mr. Khan paid the ultimate sacrifice in his family, didn’t he?” she told the African American congregation.
“And what has he heard from Donald Trump? Nothing but insults, degrading comments about Muslims, a total misunderstanding of what made our country great – religious freedom, religious liberty,” she said.
In statements released in the Republican camp, Senate Majority Leader Mitch McConnell and House Speaker Paul Ryan condemned any criticism of Muslim Americans who serve their country.
McConnell praised Capt. Khan as an “American hero”.
Both also rejected the idea of a Muslim travel ban, an idea proposed the Republican presidential candidate earlier in the campaign.
But neither statement mentioned Mr Trump by name or criticised him.
Earlier, Republican Ohio Governor John Kasich, a former rival to Mr Trump for the nomination, tweeted: “Shame on him. He has no decency, he has a dark heart.”