Sen. John McCain John Sidney McCainMomentum growing among Republicans for Supreme Court vote before Election Day McConnell urges GOP senators to 'keep your powder dry' on Supreme Court vacancy McSally says current Senate should vote on Trump nominee MORE’s (R-Ariz.) daughter, Meghan McCain, called Republican presidential nominee Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE a “barbarian” for attacking the parents of slain a Muslim American soldier.

“I would ask what kind of barbarian would attack the parents of a fallen solider, but oh yeah it’s the same person who attacks POW’s,” McCain wrote on Twitter late Saturday.

I would ask what kind of barbarian would attack the parents of a fallen soldier, but oh yeah it's the same person who attacks POW's. — Meghan McCain (@MeghanMcCain) July 31, 2016

Trump has faced backlash from Republicans and Democrats after he lashed out at Khizr Khan, the father of a U.S. soldier killed in Iraq who gave an emotional speech last week at the Democratic National Convention.

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Trump said Khan had “no right” to criticize him and questioned whether Khan’s wife, Ghazala Khan, was “allowed” to say anything.

Caroline McCain also wrote in a Medium post on Friday that she opposed Trump for questioning her grandfather’s status as a war hero.

“I like people who weren’t captured,” Trump said last summer about the senator, who was a prisoner during the Vietnam War.

“I’ve been nursing a grudge ever since,” Caroline McCain wrote, adding that she would be voting for Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE.