Billionaire Twitter CEO Elon Musk on Sunday used his social media company in a crass attack targeting a lawmaker who had criticized his assault on free speech.

Musk slammed the size of Rep. Adam Schiff s (D-Calif.) brain in a tweet.

Thankfully, you lose your chairmanship very soon, Musk wrote Sunday, referring to Schiffs position heading the House Intelligence Committee. Your brain is too small.

Schiff will step down as the committee chair as a Republican majority takes over the House.

Musks tweet taken down later in the day was in response to Schiffs tweet Friday criticizing Musks Twitter policies censoring journalists whose coverage he doesnt like, while allowing the return of Twitter users banned for spreading hate and disinformation.

Musk, for example, has allowed the Twitter restoration of notorious neo-Nazi Andrew Anglin , a racist, antisemite, homophobe and misogynist who declared in 2018 that women deserve to be beaten, raped and locked in cages.

Musk calls himself a free speech absolutist to justify turning a blind eye to hatred and bigotry on Twitter, Schiff wrote.