Online trolls and white supremacists have been attacking Jared Kushner, President Donald Trump's son-in-law and a top advisor, in an online 'onslaught' of anti-Semitic attacks, the Anti Defamation League has warned.

The attacks come as Kushner has emerged as Trump's most trusted adviser – as well as the most prominent Jewish member of his administration.

Kushner is an unpaid senior adviser to the president, with an expansive portfolio that includes Middle East peace initiatives, an innovation panel, China, and other issues.

The online attacks come as Kushner, who is an Orthodox Jew, faced off in a power struggle against Trump strategist Steve Bannon. Kushner is married to Ivanka Trump, who converted to Judaism.

'An anti-Semitic social media trolling campaign aimed at presidential adviser Jared Kushner has escalated from a series of tweets into a full-bore assault perpetrated primarily by white supremacists and anti-Semites of various stripes,' the ADL's Center on Extremism said in a statement Monday, the first night of Passover.

Trump son-in-law Jared Kushner has been the subject of a vicious online campaign that seeks to paint him as the 'bloodthirsty' driver of a Zionist conspiracy to take over the administration's agenda

'What started as a few isolated anti-Semitic tweets suggesting that Jared Kushner should be ‘fired’ because of his ‘Jewish supremacist views’ has quickly metastasized into a full-blown onslaught of anti-Semitic hate speech,” said Jonathan A. Greenblatt, the group's CEO.

The campaign began with some tweets on April 6. By the following day, the hashtag #Firekushner was trending, along with #kushneratwar and #kushnerswar,' earning mroe than 130,000 mentions, the ADL found.

The attacks come as Kushner's clash with Bannon reached the point where President Trump told the two clashing advisors to work out their differences.

Bannon has denied making antisemitic remarks himself and is a key driver of Trump’s nationalistic ‘America First’ policy.

A running theme of the attacks is that Kushner was responsible for President Trump's decision to fire Tomahawk cruise missiles at a Syrian airfield following a chemical weapons attack in a rebel area that hit men, women, and children.

'It includes 'accusations that Jews in the Trump Administration are trying to start a war to advance the interests of Israel, and that President Trump has abandoned his “America First” policy because he is being manipulated by Kushner and other Jewish advisors,' according to the ADL.

David Duke, former Ku Klux Klan grand wizard during the debate with Joe Hicks at Cal State University. He has attacked Kushner online as 'bloodthirsty' and retweeted a hashtag that came a forum for attacks

VILE: People on the threat retweeted an image of President Trump and his team getting a secure briefing on Syria, and pasted Israeli flags on Kushner and other administration members

MESSAGE OF PEACE: Ivanka Trump sent out a Passover tweet picturing her and her family on Monday

White supremacist anti-Semite David Duke was among those on the online threat the Anti Defamation League warned turned into an onslaught of anti-Semitic hate speech

Ivanka Trump tweeted out a photo Monday night, the first night of Passover, where she referenced Exodus.

'During #Passover, we reflect on the significance of the exodus from Egypt and celebrate the great freedoms we enjoy today! #ChagPesach,' she wrote, meaning 'happy Passover.'

The Firekushner hashtag is filled with hateful comments that play on tropes of a secret cabal steering government policy. One, by 'Vile_Islam' states: 'Nice how Trump's 50% Jewish advisors are convincing him to send our 0.5% Jewish military to die for #Israel.'

The tweet photo-shopped an image of Trump's team getting a briefing on the U.S. strikes on Syria – and pasted Israeli flags atop several members of the administration, including Kushner.

White nationalist anti-Semite David Duke tweeted: 'Tribalist, like Jared Kushner & many others surrounding President Trump, would love to witness another war where Whites slaughter ourselves.' He tweeted repeatedly about the Syria campaign, and retweeted the firekushner hashtag.

'These bloodthirsty Zionists have been licking their chops over the destruction of Syria for MANY years - will Trump serve them the meat?' Duke Tweeted.

On Tuesday, he tweeted: 'Ivanka needs to be removed from the White House, along with her bloodthirsty, Zionist husband!', once again pushing the FireKushner hashtag.