No. Even con men and bumbling clowns who masquerade as Presidents of countries have a right to free speech.
Sure, but Twitter is under no obligation to give him the means exercise it using their service.
Still, I don't see them giving the President of the United States the shaft. I think Trump is too good for business.
Twitter mods are famous for being ultra SJWs. Its not just the straightforward modding either. Its things like shadow banning, throttling, manipulation of trending hashtags and auto completes. Twitter mods have been manipulating their platform to favour left wing, SJW and anti Trump points of view for some time now. I'm sure they would have banned Trump if they could have got away with it. Trouble is that Twitter consistently loses money and banning Trump would only lead to that problem getting worse.