Bingo.
And how many more pregnant illegals would rush in during that intentionally slow pace, even if it was completed within 10 years? Moreover, it is quite likely succeeding Red Dem admins would cease funding.
With funding, a secure system of physical walls/electronic devices/suitable structures per terrain. etc. could be completed within 18 months by separate local contractors. (For example, see WWII)
The president made a mistake by not deploying active duty military personnel to the southern border in January 2017.
He should have kept them deployed there until the wall was built if not longer (or perhaps permanently deployed).
Virtually every other country in the world uses their military to protect their borders. Why not America?