President Trump’s former top advisor, Steve Bannon, has been suspended from Twitter over the “glorification of violence” amid the election aftermath.
Mr Bannon said a re-elected Mr Trump should fire the top infectious disease expert and the FBI director, and called for violence against them.
It comes as the tech firms continue a clampdown on misinformation.
Facebook has shut down a large group which alleges fraud, and announced new measures to amplify genuine results.
Mr Bannon, once widely thought of as one of the most powerful men in Washington, served as the boss of Mr Trump’s 2016 campaign, and as a top presidential advisor for the first several months of his presidency.
On Thursday, he posted a video podcast to Facebook, YouTube and Twitter, in which he said both Dr Anthony Fauci – the face of the country’s fight against coronavirus – and FBI Director Christopher Wray, should be fired after Mr Trump’s re-election, but also said they should be subjected to violence.
LIVE: US Election results
Charting Steve Bannon’s sharp rise and fall
Twitter hides Trump’s post-election tweets
President Trump has expressed frustration with both men, clashing with Dr Fauci over the pandemic, and with Mr Wray over what he sees as a failure to investigate his opponent, Joe Biden.
Facebook and YouTube both removed the video, but Twitter issued an outright suspension of Mr Bannon’s “war room pandemic” account, for violating its policy on the glorification of violence.
The account has been permanently suspended, rather than banned for a limited amount of time, Twitter said in a statement.
President Trump, meanwhile, had another of his tweets hidden and labelled by Twitter after falsely claiming victory and alleging the existence of “illegal votes”.
The President responded by tweeting: “Twitter is out of control”.