Ever since he entered the presidential race, there have been calls to ban Donald Trump from Twitter — and they aren't unjustified. Just last week, Trump tweeted that North Korean leader Kim Jong Un should know that he has a working nuclear button and that his is bigger. The remarks read like a transparent pissing match, except more than just ego was at stake: the fate of innocent lives were, too. Twitter's terms of service make it clear that threats are actionable offenses for banning. So why is Trump's account still up?
In a statement about accounts of world leaders, Twitter maintains that "Blocking a world leader from Twitter or removing their controversial Tweets, would hide important information people should be able to see and debate. It would also not silence that leader, but it would certainly hamper necessary discussion around their words and actions."
In short, though never explicitely mentioned, because he is a world leader, Donald Trump will not be banned. The second part of the statement highlights a business motivation for Twitter; if Trump is going to say these things, he might as well be doing it on their platform, so that they get the engagement. Read the full statement here.