So basically Trump is signalling his intent to either weaken or even abolish the judicial branch in the event of an attack.
Now here's what I don't understand. People are not "pouring in". Canada, which has 35 million people, took in three times the amount of Syrian refugees (30,000) last year than the U.S. did. On average we accept approximately 300,000 immigrants annually and I don't think that's enough. Personally, I'd love to see more accepted.
And all these people who are "pouring in" have gone through a vigorous vetting process that takes years. In reality the U.S. border extends well beyond its shores and really begins at the first point of contact with refugees overseas.
One thing that is not often said enough is that we as North Americans benefit from one thing that Europe does not: geography. It is very difficult for anyone with ill intent to just come over here, as opposed to Europe where once a terrorist reaches the continent they can basically go anywhere they please.
That, plus the vetting process is why there has been ZERO terrorist attacks launched by refugees.