Though the Kushners are far from the only famous family that's done terrible things — Hillary and Bill Clinton almost left their daughter Chelsea stranded in Russia — Charles Kushner's crimes are nothing to scoff at. During Chris Christie's law career, he prosecuted Jared Kushner's father for committing tax fraud. He was also accused of "making false statements to the Federal Election Commission" and blackmailing a witness, both of which he pled guilty to, according to the Department of Justice. Kushner was found guilty and sentenced to 14 months in prison.
Christie called this case, specifically the blackmail, "one of the most loathsome, disgusting crimes that [he] prosecuted when [he] was U.S. attorney" in a 2019 interview with PBS. While a lot can be said about Christie himself, Charles Kushner's blackmail would definitely fit that description: he hired a prostitute to seduce his brother-in-law, got a private investigator to film it, then mailed the tape to the witness — his sister. This goes way beyond the realm of petty sibling rivalry and into... well, crime.
In 2020, Trump pardoned the elder Kushner for his crimes just before his presidential term ended. This seems like it was the last straw for Christie — after throwing his support behind Trump for his (ultimately unsuccessful) 2020 campaign, he turned against the Trumps and the Kushners, setting his sights on Jared.
