The reason the Democrats are saying "NO", this ineffective wall will cost much more than the 5 billion dollar lie Trump has been trying to feed everyone. There is about 65 billion that Trump isn't talking about.
Would Trump’s border wall cost the same as one and a half U.S. aircraft carriers?
In Part,
"In February 2017, a leaked report from the Department of Homeland Security put it much higher, at $21.6 billion.
In April 2017, the Democratic staff of the Senate Homeland Security and Governmental Affairs Committee said in a report that costs could soar to nearly $70 billion — not including the significant costs and legal resources required for land acquisition".
http://www.politifact.com/california/statements/2017/apr/28/scott-peters/would-trumps-border-wall-cost-same-one-and-half-us/
I guess the Republican thinking on this is, with the trillions he has already added to the debt we owe, I guess hitting the taxpayer with another 70 or more billion isn't a big deal.
For something that isn't going to work. We are talking about a wall 30 feet high. Around 2 thousand miles or more. They will find a way around, over or under. The great wall of China didn't work. And neither will the great wall of Trump.
The failure of the Great Wall
"Considering the size and effort put into its construction over 2,000 years ago, the failure of the Great Wall of China is rather spectacular. It worked as a manifestation of power that put fear into the hearts of barbarian riders but it didn’t keep any invaders from the north out.
Rumoured to have been built using the dead, the construction took hundreds of years and some people still mistakenly believe it’s visible from the Moon. However, as a defensive measure against invading forces, it has been about as useful to China as a Bible on a battlefield. It can give you comfort, but it just won’t stop the enemy".
http://gbtimes.com/failure-great-wall
Donald Trump Loves the Great Wall of China. Too Bad It Was a Complete Disaster.
"Someone should tell Donald Trump that the Great Wall of China was a staggeringly expensive and deadly failure".
http://www.motherjones.com/politics/2016/03/great-wall-china-donald-trump/
History does repeat it's self.