Don Jr has come to Chelsea Clinton's defense labeling Muslim NYU students who blamed her for the New Zealand mosques attack as 'sickening'.
The president's son tweeted in support of the pregnant former first daughter after she was berated at the vigil at New York University on Friday.
Don Jr wrote: 'It’s sickening to see people blame @ChelseaClinton for the NZ attacks because she spoke out against anti-Semitism.
'We should all be condemning anti-Semitism & all forms of hate. Chelsea should be praised for speaking up. Anyone who doesn’t understand this is part of the problem.'
Clinton, who is pregnant with her third child, was approached by senior Leen Dweik who began castigating her in an astonishing moment caught on video.
'This right here is the result of a massacre stoked by people like you and the words that you put out into the world,' says Dweik, gesturing to the vigil for the 49 who were killed in Christchurch when a white nationalist shooter stormed two mosques.
'And I want you to know that and I want you to feel that deeply - 49 people died because of the rhetoric you put out there,' Dweik continues, jabbing her index finger toward Clinton as other students snap their fingers in apparent approval of her words.
'I'm so sorry you feel that way,' Clinton responds, only to provoke more ire from the crowd.
'What does "I'm sorry you feel that way" mean? What does that mean?' an unseen male is heard shouting from the crowd.
According to NYU student Rose Asaf, who posted the video on Twitter, students at the vigil were angry about Clinton's accusation last month that Rep Ilhan Omar, a Minnesota Democrat, used 'anti-Semitic language and tropes' while criticizing Israel.
Omar came under heavy criticism within her own party for her remarks, in which she suggested that money plays a role in U.S. foreign policy toward Israel.
Clinton was one of many who condemned Omar's remarks, writing in a tweet: 'We should expect all elected officials, regardless of party, and all public figures to not traffic in anti-Semitism.'
Asaf blasted Clinton for her criticism of Omar, saying that the former first daughter had incited a 'mob' against the Muslim congresswoman.
'People haven’t forgotten the Islamophobic mob she incited against @IlhanMN. There is no sense of responsibility,' wrote Asaf, who identified herself as a 'Jewish leftist' in her Twitter profile.
Asaf has served in the NYU student senate as Senator at-Large for Marginalized Jewish Students, Student Activists, and Students With Mental Health Struggles, according to published reports.
Asaf wrote in a tweet that Dweik is a 'bold a** palestinian muslim woman' who 'doesn't have anything to apologize for.'
Her Twitter account has since been set to private.
Dweik was tagged in Asaf's post as Twitter user @vivafalastin, whose profile says she is an NYU senior and features the Palestinian flag.
Dweik wrote in a Twitter post about the vigil: 'i was on the verge of tears all day today and actually cried on my into and during prayer but the charade of a vigil where more non-muslims than muslims spoke and chelsea clinton was invited made me so viscerally angry and i will not apologize for that.'
Dweik was identified in a November article as an Alternate Senator-at-Large for Middle Eastern and North African Students and Documented Non-citizen Students at NYU.
A dozen are still in critical condition after Friday's attack in New Zealand, where a heavily armed shooter stormed two mosques, firing indiscriminately in a horror massacre that he broadcast live on Facebook.
Australian-born Brenton Tarrant, 28, appeared in court on Saturday to face initial charges in the case.
He stood in the dock wearing handcuffs and a white prison smock, as the judge read a single murder charge against him. A raft of further charges were expected.
Tarrant posted a manifesto online prior to the attack, in which he stated that he was an 'eco-fascist' opposed to Muslim or other immigration to Western countries.
He wrote that he hoped the attack would heighten divisions over gun control policy in the U.S., which he speculated would lead to a civil war along political, cultural and racial lines.
Tarrant in his writing cited U.S. conservative commentator Candace Owens as the single greatest influence on his radicalization.
Owens, who is black, dismissed that claim as 'pointedly absurd' in a statement.