It sure isn’t national security.
No, this is just a messy, chaotic, and unjustified attempt at proving he can stand up to Muslims- but only the non-threatening ones.
Benjamin Wittes wrote an insightful article on Lawfare:
On the underinclusive side, the order wouldn’t have blocked the entry of many of the people responsible for the worst recent terrorist attacks. There is, in fact, simply no rational relationship between cutting off visits from the particular countries that Trump targets (Muslim countries that don’t happen to be close U.S. allies) and any expected counterterrorism goods. The 9/11 hijackers, after all, didn’t come from Somalia or Syria or Iran; they came from Saudi Arabia and Egypt and a few other countries not affected by the order. Of the San Bernardino attackers (both of Pakistani origin, one a U.S. citizen and the other a lawful permanent resident), the Orlando shooter (a U.S. citizen whose parents were born in Afghanistan), and the Boston marathon bombers (one a naturalized U.S. citizen, one a green card holder who arrived in Massachusetts from Kyrgyzstan), none came from countries listed in the order. One might argue, I suppose, that the document is tied to current threats. But come now, how could Pakistan not be on a list guided by current threat perception?
If this executive order was supposed to advance national security, then there is no explanation for why it only includes Muslim countries that aren’t actual threats to the United States or aren’t allies.
When do you do these things? You do these things when you’re elevating the symbolic politics of bashing Islam over any actual security interest. You do them when you’ve made a deliberate decision to burden human lives to make a public point. In other words, this is not a document that will cause hardship and misery because of regrettable incidental impacts on people injured in the pursuit of a public good. It will cause hardship and misery for tens or hundreds of thousands of people because that is precisely what it is intended to do.
There is no justification for this chaotic move. It’s simply a cruel way to prove he’s a strongman figure- and proving himself weak at every turn.