Q&A: Who’d gain from a Trump border wall?

LOS ANGELES (AP) — As a billionaire developer, Donald Trump built casinos, luxe condo towers and lush golf courses. Now, as president, Trump aims to develop perhaps his most ambitious and surely his most contentious project yet: A wall along the nearly 2,000-mile U.S.-Mexico border.
How? At what cost? And who would benefit?
Much remains unknown. Ultimately, though, experts say the project, if built, could deliver a windfall for some large construction companies and their suppliers. Enginee