X is preventing users from posting links to a newsletter containing a hacked document that’s alleged to be the Trump campaign’s research into vice presidential candidate JD Vance. The journalist who wrote the newsletter, Ken Klippenstein, has been suspended from the platform. Searches for posts containing a link to the newsletter turn up nothing.

The document allegedly comes from an Iranian hack of the Trump campaign. Though other news outlets have received information from the hack, they declined to publish. Klippenstein says in his newsletter that a source called “Robert,” with an AOL email address, offered him the document. Contained in it are what appear to be Vance’s full name, addresses, and part of his social security number.