U.S. President Barack Obama has expressed his support for the Khan family and other "Gold Star" families who lost a child to war.
His words come as Donald Trump tries to change the subject after he attacked the family.
Our U.S. correspondent Priscilla Huff has an update:
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Following on his speech at the 2016 Democratic Party Convention, Khizr Khan and his wife Ghalaza have made a series of media appearances, to reiterate their point that Donald Trump is ignorant and unfit to hold the nation's highest office.
They are considered a Gold Star family because they lost their son, a U.S. solidier in 2004 during military operations in Iraq.
To the conference of Disabled American Veterans, President Obama said Gold Star families make one of the greatest sacrifices.
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