It appears we may have all the monies needed to build a wall. We might need a little legal advice and mumble jumble lawyereze but the 1st site on pages 5 & 6 gives the President the ability to use the funds for the global war on Terrorism and build the wall.
https:// legcounsel.house.gov/Comps/Balanced%20Budget%20And%20Emergency%20Deficit%20Control%20Act%20Of%201985–(Part%20C).pdf
The second site below designates the funds can be used based on the presidential memo to speaker Ryan.
https:// www.whitehouse.gov/briefings-statements/text-letter-president-speaker-house-representatives-president-senate-21/
The 3rd site is the current bill and the funding. Page 1434.
https:// www.congress.gov/115/bills/hr1625/BILLS-115hr1625eah.pdf
So if I am right the funds are there the designation has been made to build the wall against global terrorism.