$5 billion is a drop in the bucket of the federal budget. If Democrats want their way and have fewer humans guarding the border, we need to have something in place of that, like a wall/fence. Relative to every other option, the wall is cheap and requires relatively little maintenance long-term. The Democrats have yet to present an alternative to the wall/fence. If they did I’d happily consider something. I don’t like the idea of restricting asylum claims to ports of entry, which the wall serves to enforce, but no one has proposed an alternative yet. So right now it appears the Democrats just don’t want to agree with Trump on anything, regardless of what it is. Obama also wanted to build a border fence, but now that Trump wants to do it it’s suddenly a bad idea.