American citizens funding the Trump Wall is actually feasible.

The chances of winning the Mega Millions lottery is 1 in 302,575,35 but they have a "Just the Jackpot" option, allowing 2 plays for $3. This makes your chances of winning the jackpot 1 in 151,287,675.

President Trump's current approval rating is at 39% of the US population. The United State's population as of 2017 was 325,700,000. That makes 127,023,000 Trump supporters.

If every 3 in 5 of Trump supporters (60% or 76,213,800) were to purchase two "Just the Jackpot" tickets every drawing, they would win every time.

At a default jackpot of $40,000,000 with a current cash option of about $23,900,000 twice a week, a total of $2,485,600,000 would be raised annually. It would be funded in approximately 2 years and 3 months.