Actually, Trump has said his entire purpose in causing the shutdown is to keep the aliens out. Where have you been?
More concerning is the Trump administration's claim that the shutdown would not affect essential services. For my part, I think TSA screeners should be considered essential. I don't want any overworked/ unpaid screeners inspecting baggage on my plane.
But see this link:
https://www-m.cnn.com/2019/01/04/politics/shutdown-tsa-screening/index.html?r=https://www.bing.com/search?q=tsa+workers&form=APIPH1&PC=APPL
Even if screeners aren't considered "essential," Trump should have anticipated that his political shutdown would affect the availability of screeners and, as a self-proclaimed "best President ever" in many self-proclaimed categories, Trump should have either made sure we have plenty of screeners to do that job or should have shut down the airports. Instead, what he has done looks like keeping the swimming pools open without having enough lifeguards.
If Trump's political shutdown continues a few more weeks, it is entirely possible that overworked, unpaid screeners will make mistakes.