>Thought there was a court case where Trump was not allowed to block on Twitter.
DOJ says Trump's tweets are official presidential statements
https://www.abajournal.com/news/article/government_says_trumps_tweets_are_official_presidential_statements
Knight First Amendment Institute v. Trump, 928 F.3d 226 (2019)
The court ruled that the @realDonaldTrump Twitter account is "a presidential account as opposed to a personal account", and blocking people from it violates their rights to participate in a "designated public forum". https://en.wikipedia.org/wiki/Knight_First_Amendment_Institute_v._Trump#