Are you sure it is their "corporate masters" who are driving this deal.
What particular special interest has a particularly special interest about keeping the border open?
What particular special interest has particularly large sums of money to spread around?
What particular special interest will stop at nothing to achieve their aims?
If you answered "drug cartels", you share my suspicions.
That question can be answered at "opensecrets.org" under "donor lookup"
In terms of increasing the guest worker programs, absolutely yes. The American Chamber of Commerce, Rupert Murdoch, the Koch brothers, Mark Zukerberg, Bill Gates, and others have spent millions to get this bill passed.
What particular special interest has a particularly special interest about keeping the border open?
The border is a different issue. There is no doubt that the amount of money involved in the drug trade is a corrupting factor. How far it extends and who is involved is another matter.
Mexico is also our third largest trading partner. There is a huge amount of daily traffic across the border. Millions of Mexicans hold border crossing cards(BCC). They go shopping in US border towns. There are economic reasons why many want the border to be as open as possible.