WEST PALM BEACH, Florida (AP) — President Donald Trump retweeted a post that included the alleged name of the anonymous whistleblower whose complaint ultimately led to Trump’s impeachment by the House.

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.

Trump has repeatedly backed efforts to unmask the whistleblower. But his Friday night retweet marks the first time he has directly sent the alleged name into the Twitter feed of his 68 million followers.

Unmasking the whistleblower, who works in the intelligence field, could violate federal protection laws that have historically been supported by both parties.

The whistleblower filed a complaint in August about one of Trump’s telephone conversations with Ukraine’s President Volodymyr Zelenskiy and other dealings with the Eastern European nation. The complaint prompted House Democrats to launch a probe that ended with Trump’s impeachment earlier this month. The matter now heads to the Senate, where the Republican majority is expected to acquit the president.

The central points from the whistleblower’s complaint were confirmed during the House impeachment hearings by a string of diplomats and other career officials, many of whom testified in public. The White House also released a transcript of Trump’s July 25 phone call with Zelenskiy, in which he asks for help investigating former Vice President Joe Biden and the Democratic National Committee.

Speculation about the whistleblower’s identity has been circulating in conservative media and on social media for months.

US whistleblower laws exist to protect the identity and careers of people who bring forward accusations of wrongdoing by government officials. The Associated Press typically does not reveal the identity of whistleblowers.

Trump insists he did nothing wrong in his dealings with Ukraine and has asserted that the whistleblower made up the complaint, despite its corroboration by other officials. Trump also argues that he has a right to face his accuser and has called on the whistleblower to step forward.

For months, an array of right-wing personalities, amateur pro-Trump internet sleuths and some conservative news outlets have published what they claim to be details about the whistleblower, including name and career history. The president himself has also been inching closer to outing the individual; earlier this week, Trump shared a tweet linking to a Washington Examiner article that included the alleged name.