It is protected from the government. Of course, Twitter can decide to censor whatever they want, but if the government was threatening either Twitter or individuals on the platform, over protected speech, eg. criticizing the president, that would certainly implicate the 1A.
The government simply asking, with no implied threat, seems to be OK [1]. But, I don't think it builds confidence amongst the citizens if they were seen doing this very often.
1. https://reason.com/volokh/2021/07/19/when-government-urges-p...