"U.S. Customs and Border Protection officers at the ports of entry recorded 6,833 inadmissible aliens trying to enter. The Border Patrol, meanwhile, nabbed 18,198 people who had sneaked across the border.
The combined number of 25,031, while the highest under Mr. Trump, is
lower than any month under Mr. Obama dating back to December 2011.
When considered on a year-to-year basis, the gains are indeed stunning. In July 2016, the Border Patrol nabbed 33,737 illegal immigrants — 85 percent more than this year’s total."
Illegal immigrants cost taxpayers nearly $750 billion over lifetime: Report
The Fiscal Burden of Illegal Immigration on United States Taxpayers
"This report estimates the annual costs of illegal immigration at the federal, state and local level to be about $113 billion;"
Exclusive - Trump border 'wall' to cost $21.6 billion, take 3.5 years to build: internal report
In a sense the the wall has already been paid for four times over simply by illegal immigration being down by 80%. The recent uptick is obviously due to the new composition which are more difficult to deport by the inclusion of weaponized families.
And by the lack of money flowing from the US to Mexico by increased values...Mexico has paid for the wall, enforcement, healthcare. etc. and will continue to do so.