Elon Musk has threatened to sue the Anti-Defamation League and accused it of causing an advertising revenue slump on X since his takeover of the former Twitter.
In a post on X, Musk accused the ADL of "trying to kill this platform by falsely accusing it & me of being anti-Semitic."
It was after the nonprofit reported increased hate speech on the platform after reinstating banned accounts.
The spokesperson said: "ADL is unsurprised yet undeterred that antisemites, white supremacists, conspiracy theorists and other trolls have launched a coordinated attack on our organization.
“This type of thing is nothing new.
"This onslaught comes following our participation in the 60th Anniversary of the March on Washington, where ADL proudly marched shoulder-to-shoulder with African American leaders and those from other minority communities.”
The spokesperson added: “It also follows a meeting with the leadership of X ... that clearly upset these hateful groups.
"Such insidious efforts don't daunt us. Instead, they drive us to be unflinching in our commitment to fight hate in all its forms and ensure the safety of Jewish communities and other marginalized groups."
