The outage sparked discussion of the security of Trump's account, given the potentially dire consequences of messages falsely attributed to the president.
Twitter has handed over to Senate investigators the profile names, or "handles", of 201 accounts linked to Russian attempts at influencing the 2016 presidential election.
A spokesperson for the White House did not immediately respond to requests for comment.
The person at Twitter who temporarily deleted President Trump's account wasn't a full-timer.
The San Francisco-based social media company says it's conducting a "full internal review" and taking steps to prevent it from happening again.More news: Hands-on: HTC U11 Life review
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In response to Twitter's statement about its investigation, one user said: "I am assuming you're investigating who should get a million dollar bonus?"
There is so much tomfoolery, fake news, and just plain meanness that emanates from Trump's Twitter feed, many of Trump's supporters and enemies have attempted to curb his addiction to his favorite social media platform.
He added: "Seriously, what if this person had tweeted about a fictional nuclear strike on North Korea?"
In the end, the Trump's account was missing for a total of 11 minutes.
Many praised the temporary shutdown of Trump's account, with users saying the unnamed employee responsible "deserves a medal" and that "not all heroes wear capes". The statements made in the personal account, repeatedly violated the Protocol of the President of the United States, ahead of press briefings and statements by other officials. Trump did not react to the temporary account removal until almost 12 hours later.