The figured being suggested for border wall funding are large.

Corruption has been found in some of the past border wall building efforts.

New allegations in border fence lawsuit: racketeering, bribes and money laundering

Recent court filings in a case brought by Hidalgo County against a former employee who oversaw construction of a Bush-era border barrier allege a vast kickback scheme worked out over drinks and steak dinners.

The Texas Tribune

Some have gone so far as to question whether Trump or Trump cronys might personally profit.

Could Trump's "big, beautiful wall" be a profit engine — for him?

Trump's entire career has been mired in corruption. Why should his ludicrous border wall be any different?

Salon

Certainly an area to keep an eye out, even among some of the recent companies involved with border wall prototypes.

Project On Government Oversight

POGO is a nonpartisan independent watchdog that investigates and exposes waste, corruption, abuse of power, and when the government fails to serve the public or silences those who report wrongdoing.

POGO