Just so you know, there were never billions appropriated.
https://www.washingtontimes.com/news/2006/jul/14/20060714-120633-1188r/
... Less than two months after voting overwhelmingly to build 370 miles of new fencing along the border with Mexico, the Senate yesterday voted against providing funds to build it.
“We do a lot of talking. We do a lot of legislating,” said Sen. Jeff Sessions, the Alabama Republican whose amendment to fund the fence was killed on a 71-29 vote. “The things we do often sound very good, but we never quite get there.”
Mr. Sessions offered his amendment to authorize $1.8 billion to pay for the fencing that the Senate voted 83-16 to build along high-traffic areas of the border with Mexico. In the same vote on May 17, the Senate also directed 500 miles of vehicle barriers to be built along the border...
Thank you.