Just before midnight Friday, Trump retweeted a message from Twitter user @Surfermom77, an account that claims to be a woman named Sophia who lives in California. The account shows some indications of automation, including an unusually high amount of activity and profile pictures featuring stock images from the internet.

By Saturday morning, the post seemed to have disappeared on many users' feeds, suggesting Trump had deleted it, though it could still be found in other ways, including on a website that logs every presidential tweet.

The retweet then reappeared Saturday night. Twitter told The Associated Press that an outage with one of its systems caused tweets on some accounts, including Trump's, to be visible to some but not others.