All they seemed to be saying was they would consider any action that protects the country. They haven't said Japanese internment camps are a good idea or that they are going to do it, but it does seem to be a way to suggest that a registry is appropriate, just as people thought the internment camps were appropriate in the past.
And I have no strong opinion on the matter and feel like context is very important, so please don't freak out because I'm not freaking out. It's all seems like empty words to me right now. If something serious happens later on, like some major terrorist attacks, then shits going to get real and this would be something to worry about, but right now there's not much there, really. Media is blowing this out of proportion.