Donald Trump Jr. made a reference to "a gas chamber" during a radio interview on Wednesday while accusing the media of being a surrogate for Hillary Clinton.
"The media has been her number one surrogate in this," he said. "Without the media, this wouldn't even be a contest, but the media has built her up. They've let her slide on every in-discrepancy, on every lie, on every DNC game trying to get Bernie Sanders out of the thing.
"If Republicans were doing that, they'd be warming up the gas chamber right now," he continued.
Trump Jr. made his comment during a radio interview with Philadelphia-based talk radio host Chris Stigall on 1210 WPHT.
Leaked emails showed that members of the Democratic National Committee played favorites during the primaries and tried to undermine U.S. Sen. Bernie Sanders presidential campaign.
Trump Jr. said that the American Left was trying to ensure that moderators were unfair to his father during the upcoming presidential debates.
Hillary Clinton's campaign released a response to the remark, calling it an example of the Trump campaign being "insensitive, divisive and reckless."
"Offensive references to the Holocaust are never acceptable, especially from a Presidential campaign," said Sarah Bard, Hillary for America's director of Jewish Outreach.
The Anti-Defamation League, which works to counter anti-Semitism around the world, tweeted that trivilization of the Holocaust and gas chambers "is NEVER okay" and called on Trump Jr. to retract his comment.
The Trump campaign issued a statement in light of the media coverage on Wednesday afternoon, saying Trump Jr. "was clearly referring to capital punishment to make the case that the media continues to take words out of context."