[Kursk]

Perhaps the EO is a message to all especially those who sit on the fence wherever they might be, that you are either with the US or against it and if you prefer to be non-committal about your intentions you may find you become collateral damage? The EO is temporary presumably so that sympathies can be established.

The President is acting on his word which is what his supporters, the majority of the electorate, expect and he is reaching them directly through twitter to be assured what he says isn't massaged before dissemination.