Trump tweeted “We will not be SILENCED!” from the @POTUS government account, with 33.4 million followers.
Twitter had permanently suspended the president’s go-to megaphone, his @realDonaldTrump personal account, hours earlier.
The company said accounts used by Trump to try to get around the ban could face permanent suspension as well under its “ban evasion” policies.
“Twitter is not about FREE SPEECH,” Trump wrote in the now-deleted tweets, adding that he is considering building his own social media platform in the near future.
Twitter shut down his @TeamTrump campaign account shortly after it sent out a tweet with a “statement from President Trump” accusing Twitter of “banning free speech” and coordinating with “the Democrats and the Radical Left” to silence him.
The account shortly before that had pointed its 2.3 million followers to its account on Parler, which is popular with conservatives for its hands-off approach to content moderation.
Alphabet Inc’s Google suspended Parler on Friday, citing posts inciting violence, while Apple Inc gave the service 24 hours to submit a detailed moderation plan.
It was the first time Twitter has banned a head of state, the company confirmed.
Social media companies have moved swiftly to crack down on Trump and some of his prominent right-wing allies and supporters in the wake of the turmoil in Washington, DC, on Wednesday, which led to five deaths.
Trump has repeatedly used Twitter and other platforms to claim his defeat in the Nov. 3 election was due to widespread voter fraud and to share other conspiracy theories, and had urged supporters to come to Washington on Wednesday and march on the Capitol to protest the election result.
Facebook Inc said earlier this week it was suspending his account through until at least the end of his presidential term.
The Republican president is due to hand over to Democratic President-elect Joe Biden on January 20.
In a blog post on Friday, Twitter said that two of the president’s tweets posted that day were in violation of its policy against the glorification of violence.
Twitter had temporarily blocked Trump’s account on Wednesday following the siege of Capitol Hill, and warned that additional violations by the president’s accounts would result in a permanent suspension.
Trump was required to delete three rule-breaking tweets before his account was unblocked. He returned to Twitter on Thursday with a video acknowledging that Biden would be the next US president.
Twitter said that Trump’s tweet that he would not be attending Biden’s inauguration was being received by a number of his supporters as confirmation that the November election was not legitimate.
It said another tweet praising “American Patriots” and saying his supporters “will not be disrespected or treated unfairly in any way, shape or form!!!” could be seen as “further indication that President Trump does not plan to facilitate an orderly transition.”
Critics of major social media platforms, including top Democratic politicians, praised Twitter’s move and said it was long overdue, while Trump suppporters expressed outrage.
The president’s son, Donald Trump Jr, in a tweet on Friday decried the ban, saying dictators who had threatened genocide continued to have Twitter accounts. He did not provide names.
The White House had no immediate direct comment. The Trump campaign’s Twitter account criticized the company for “silencing” the president of the United States.
‘LOOTING AND SHOOTING’
Trump’s prolific use of social media helped propel him to the White House in 2016. He has used his personal @realDonaldTrump account, which has sometimes tweeted more than 100 times a day, to reach supporters, spread misinformation and even fire staff.
In a 2017 interview on Fox Business, Trump said “I doubt I would be here if it weren’t for social media, to be honest with you,” according to a transcript released by the network.
Both Twitter and Facebook have long afforded Trump special privileges as a world leader, saying that tweets that may violate the company’s policies would not be removed because they were in the public interest. They said he would lose access to those privileges upon leaving office, however.
Twitter last year started labeling and putting warnings on Trump’s tweets that broke its rules against glorifying violence, manipulated media or sharing potentially misleading information about voting processes.