Graham: Trump 'going to a place where we've never gone before'
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Sen. Lindsey GrahamLindsey Olin GrahamMcConnell faces GOP pushback on debt deal Bottom line GOP senators introduce bill targeting Palestinian 'martyr payments' MORE joined the growing chorus of criticism Sunday for GOP presidential nominee Donald TrumpDonald TrumpSenate rejects attempt to block Biden's Saudi arms sale Crenshaw slams House Freedom Caucus members as 'grifters,' 'performance artists' Senate confirms Biden's nominee to lead Customs and Border Protection MORE’s remarks about Khizr and Ghazala Khan, the parents of a Muslim American soldier killed in Iraq.

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The South Carolina Republican told The New York Times on Sunday that Trump’s comments crossed a line after the businessman tweeted that Khizr Khan "viciously attacked" him.

“This is going to a place where we’ve never gone before, to push back against the families of the fallen,” Graham told the Times.

“There used to be some things that were sacred in American politics, that you don’t do, like criticizing the parents of a fallen soldier, even if they criticize you.

“If you’re going to be leader of the free world, you have to be able to accept criticism, and Mr. Trump can’t.”

Trump sparked controversy late last week when he lashed out at Khan over his speech at the Democratic National Convention, which was critical of Trump. The billionaire doubted whether Khan prepared his remarks and questioned his wife’s silence on stage.

Following the backlash, Trump in a statement late Saturday called Capt. Humayun Khan a "hero" but continued to criticize Khizr Khan.