Bush said Trump's immigration proposals would be too costly and impractical.
Mexicans threatened by drug cartels or their lackeys in government seek asylum in the U.S.
The invasion of America's southern border is the greatest crisis facing our nation.
Sending the children back means putting them in danger.
What are the key facts and the potential long-term solutions?
The immigration crisis is likely to get worse before it gets better, if Congress does not act.