The Web page, titled “The October surprise that will end Trump,” allows users to sign up for help registering to vote in the Nov. 8 presidential election and encourages them enlist their friends as well.

“At a time when Trump is trying to divide us, we could help defeat him if we all share this page with EVERYONE. Let’s reach every US voter abroad,” it reads.

The tweet was deleted within 20 minutes, without explanation.

Ari Gaitanis, chief of the U.N. News Services Section, which oversees the twitter account, said it was a mistake.