Pelosi, Schumer To Trump: "Let's Debate Border Funds in Private"

[Mike M (the other one)]

(12-18-2018, 10:36 AM)GMDino Wrote: The debate is over Matt.  30% of the US population no longer will need to look up numbers or understand studies or policies.

Illegal immigration costs the United States more than 200 Billion Dollars a year. How was this allowed to happen?

— Donald J. Trump (@realDonaldTrump) December 18, 2018

Did he list where he got the numbers from?
if so, please provide, I'm don't follow him.