Democrat Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE's presidential campaign on Thursday used a remark from rival Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE's son invoking gas chambers to blast the GOP candidate's operation as "reckless" and "deplorable."

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"Offensive" references to the Holocaust are "never acceptable, especially from a presidential campaign," Clinton's director of Jewish outreach, Sarah Bard, said.

Donald Trump Jr. said on a local radio program Wednesday that the media would be "warming up the gas chamber" if Republicans were caught lying, which he accused Clinton of doing.

The comment shows how "insensitive, divisive, and reckless the Trump campaign is," Bard said.

Trump on Thursday reportedly denied to NBC News that he was making a reference to Nazi gas chambers, arguing instead that he was referring to corporal punishment.

Trump Jr. tells @KatyTurNBC that his "gas chamber" comment is referencing corporal punishment, not in any way anti-Semitic. — Micah Grimes (@MicahGrimes) September 15, 2016 Still, he continued to face criticism, with another Clinton aide calling the remark "deplorable" and "indefensible." Joking about gas chambers is deplorable. Indefensible. https://t.co/B9BI5ioXon — Ian Sams (@IanSams) September 15, 2016

The "gas chamber" language also drew the ire of the Anti-Defamation League, which remarked Thursday on the "hurt of making Holocaust jokes" and called on him to retract the comment.

.@DonaldJTrumpJr: We hope you understand the sensitivity and hurt of making Holocaust jokes. We hope you retract.https://t.co/jL2ZC9Z8pH — ADL (@ADL_National) September 15, 2016

Evan McMullin, a conservative independent presidential candidate, called the remark an "unsurprising Nazi reference" from Team Trump in a post that Clinton retweeted

An unsurprising Nazi reference from the "alt-right" movement's presidential campaign. This is the real Trump. https://t.co/HOUgRC8343 — Evan McMullin (@Evan_McMullin) September 15, 2016

Trump's campaign has previously faced charges of anti-Semitism, which it has vociferously denied. Trump has pointed to his daughter Ivanka's relationship with Jared Kushner, who is Jewish, remarking on the pair's "beautiful Jewish baby" earlier this year and saying he has many friends who are Jewish.

The Clinton campaign's statement Thursday recalled the controversy over Trump's Twitter account sharing an image of Clinton over a background of money that labeled her "corrupt" in a six-pointed star, as well as instances where he has retweeted white supremacists.

Trump's three adult children have been active in his White House bid and regularly appear at campaign events and in media appearances defending their father.