There's fuking money all over the place to fund the wall.
The Treasury Inspector General for Tax Administration confirmed that Additional Child Tax Credits for ITIN (the tax classification that illegal immigrants use) reached $4.2 billion in the year 2010, noting: “The payment of Federal funds through this tax benefit appears to provide an additional incentive for aliens to enter, reside, and work in the United States without authorization, which contradicts Federal law and policy to remove such incentives.”
Interesting. The number has almost certainly grown larger than $4.2 billion since 2010. Why? Because the IRS actively ignores warnings from the Social Security administration about illegal aliens using fake Social Security numbers.
https://bigleaguepolitics.com/confirmed-president-trump-could-build-the-wall-with-tax-refunds-government-gives-to-illegal-immigrants/