"The Republican nominee is unfit to serve as president and he keeps on proving it," Mr Obama said on Tuesday as quoted by BBC. "The notion that he would attack a Gold Star family that made such extraordinary sacrifices... means that he is woefully unprepared to do this job."
At last week's Democratic National Convention, a Muslim whose son was killed serving in the US military in Iraq criticised Trump's plan to temporarily ban Muslims from entering the US. Trump responded by attacking the "Gold Star" family, the term for families that have lost a relative in war. Democratic and Republican leaders as well as veterans' groups quickly condemned him.
"What does this say about your party that this is your standard bearer?" Mr Obama asked Republicans. "This isn't a situation where you have an episodic gaff, this is daily and weekly where they are distancing themselves from statements he's making."
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