It's disappointing to see Mikey not answer that question because, if anything, the answer continues to strengthen the case against Trump's rash and (potentially) unconstitutional actions in signing the Executive Order.
The countries on the list (Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen) were indeed regarded by the Obama administration as "of concern". At least four in that list make a lot of sense to be seen as such; the other three probably do as well although I'm less up to date with, for example, Yemeni current affairs.
In that sense, then -- yes, there is a certain partial logic to a focus on those countries in particular. The problem comes with how to deal with that. Obama's action of placing these countries on a list of countries of concern essentially tightened visa restrictions but still allowed people in having passed relevant security checks. It also was particularly focused at people visiting those countries, rather than all citizens of those countries, perhaps with the idea of terrorist training camps in mind.
Trump's action goes far, far further, and unreasonably so. It does not follow by virtue of being a Syrian citizen that you must be regarded as a heightened threat. After all, Syrian citizens include babies, who aren't threats to anything; they also include scientists, who work in US universities; and they include people who have already passed through some of the most stringent security checks possible.
This means that Trump's policy isn't an extension of Obama's, but some sort of corruption of it. By failing to follow proper procedure the EO is anyway likely to be unconstitutional, and therefore illegal; Trump will have to redraft it or face a lengthy court battle. And he certainly can't point to previous adminstration's actions to defend this one.
All of which Mikey could/ should have said for himself, of course. It's a fair question, Talbot -- but the answer is still more damning of Trump's rashness and reckless disregard for due process.