It is obviously a slippery slope, and I would just leave it as - Twitter should treat Trump (or any blue check) the same as everyone else.
If Trump sends a tweet that violates the terms and conditions of Twitter, then it should be dealt with by Twitter - otherwise twitter opens themselves up to lawsuits claiming discrimination for disparate treatment.
(I offer no opinion on whether his latest tweets (or any tweets) violate the TOS because I have no idea what the TOS are).
The reality is Trump drives clicks/eyeballs to twitter, which in turn drive ad-revenue to Twitter - so of course there are different rules for people like Trump.