President Trump has kept the government shut for the longest time in US history. His reasoning being border security. A wall, or fence, or structure is all that is needed to stop unwanted and illegal immigration and make America safe.
There have been many studies published which explain why such approach is more symbolic and effective, but these studies have been labeled biased, liberal, fake or all of the above.
So how effective would such a barrier be? Find out from the mouths of the very Americans it intends to protect. Not from the media, or studies, but from Texans dealing with the very barrier the President is trying to erect.