Twitter locked Donald Trump's account on Tuesday (NZ time) after he shared the email address of a New York Post columnist.
The US President's account was locked for posting private information without consent, the social media giant confirmed to Business Insider on Wednesday.
In a tweet on Tuesday, Trump praised and quoted columnist Miranda Devine for her Sunday column in the New York Post.
In the column, Devine applauded Trump for overcoming his battle with COVID-19, saying he will "show America we no longer have to be afraid".
In the now-deleted tweet, Trump followed up his praise by posting Devine's email address, which is against Twitter's privacy information policy.
The tweet now shows the message: "This Tweet is no longer available because it violated the Twitter rules".
Devine said she received a barrage of abuse from people after Trump tweeted her email address.
"You suck", "Trump simp", "Chinese virus? You racist pig", were just a handful of the insults sent to Devine, she told the Daily Telegraph on Wednesday.
Trump tested positive for COVID-19 on Friday and was admitted to hospital on Saturday, suffering breathing difficulties.
Returning to the White House on Tuesday morning, Trump said he "felt better than 20 years ago" in a tweet.
"Don't be afraid of COVID. Don't let it dominate your life. We have developed, under the Trump Administration, some really great drugs & knowledge. I feel better than I did 20 years ago!"
Shortly afterwards, video footage suggesting Trump was short of breath was released and went viral online.
Trump has repeatedly downplayed the severity of COVID-19, which has now killed more than 1 million people worldwide and 211,000 people in the US.