The EB-5 investor visa program enables foreigners who make an investment in a U.S. business to obtain a green card and become lawful permanent residents, and eventual citizens, of the United States. I think this means they legally buy their green card instead of hiring a coyote to cross the southern border.
"The father of a Muslim-American soldier killed in Iraq who is caught up in a war of words with Republican presidential candidate Donald Trump is an immigration lawyer who specializes in a highly controversial program accused of letting immigrants buy their way into the U.S.
Khizr M. Khan's website notes that he works to help clients with the E-2 and EB-5 programs that let overseas investors buy into U.S. companies and also provides green cards for family members." (Washington Examiner)
Khan's website is down or has been removed. I'm shocked. They baited Trump on this one, but perhaps he can turn the tables.