Generally?
The justification that some of his surrogates have put forth is that the countries involved have previously been designated as potential sources of terrorism during the Obama administration. Superficially, that would seem like a good reason.
It's fairly obvious however that the measure is only intended to placate those voters who were attracted to his promise of a Muslim ban. A proposal that was a flagrant violation of the US constitution.
They put hardly any effort at all in arguing there's a serious, urgent need for the measure (the USA already had an extremely thorough vetting process to begin with) and implemented it overnight, without any regard for people who'd been through weeks (if not months) of paperwork and would end up being turned away at the airport.
Maybe the order will largely survive constitutional review in the end. Regardless it's a meanspirited measure, and dishonest in its motivations (since it's only aimed at keeping campaign promises, not genuine security concerns)
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