Apples and oranges. Why does this wall have to be built immediately? It's almost 16 years since 9-11 and Congress has not fulfilled THEIR job to secure the border. It was all blah, blah, blah...And Obama turned it into an even worse mess.
Sometimes it's better to just slow down a bit....and that's what they're doing.
"Why does this wall have to be built immediately?"
It doesn't, but every day thousands of illegal immigrants are crossing the border, so the sooner the better. It is about 50 years too late already.