Israeli Prime Minister Benjamin Netanyahu (second from left) and son Yair (left) pose for a photo in Tel Aviv. AP

As scandal-plagued Prime Minister Benjamin Netanyahu stands trial for corruption, his 28-year-old son has emerged as a driving force in a counterattack against critics and the state institutions prosecuting the longtime Israeli leader.

A favorite of the prime minister’s nationalistic base and far right leaders around the world, Yair Netanyahu has become a fixture in the news, clashing with journalists on social media, threatening lawsuits against his father’s adversaries and posting online content deemed so offensive that Facebook briefly suspended his account.

In the past month alone, he has called to banish minorities from Tel Aviv, tweeted a discredited conspiracy theory that former President Barack Obama was born in Kenya and intimated that a critical Israeli broadcast journalist slept her way up to her coveted job.

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But his toughest broadsides have been directed at the Israeli media, judiciary and law enforcement for conducting what he has called a leftist, ideological crusade to topple his father. He’s called for the attorney general to be investigated for his "crimes,” compared the police chief to fictional mob boss Tony Soprano and described investigators as the Stasi, Gestapo and "the political police of the Israeli junta.”

It’s part of a campaign, echoed to a lesser degree by his father, that critics warn is eroding public faith in Israel’s democratic institutions.

"We would love to just disregard him as a curiosity, as this difficult kid who keeps embarrassing his father. But the truth is there is evidence that he is very influential,” said Raviv Drucker, a well-respected investigative TV reporter and favorite target of the Netanyahus, whom both father and son recently tweeted they would like to see imprisoned. "He holds very extreme positions and it affects the prime minister’s actions.”

Though he holds no official position, Yair Netanyahu is considered a key adviser and the mastermind of his father's increasingly confrontational social media strategy.

Netanyahu faces charges of fraud, breach of trust and accepting bribes in a series of corruption cases stemming from ties to wealthy friends. He denies the charges, which follow years of scandals swirling around the family.