http://www.breitbart.com/big-government/2017/12/11/dhs-subway-suicide-bomb-suspect-is-chain-migrant/
Ullah, as confirmed by the Department of Homeland Security (DHS), entered the U.S. in 2011 as a chain migrant.
Under “chain migration,” new immigrants to the U.S. are allowed to bring an unlimited number of poorly-screened foreign relatives with them, creating a never-ending flow of immigration from some terror-ridden countries.
Ullah came to the U.S. through the F43 visa, allowing him to obtain a Green Card simply because his father’s brother or sister had recently been naturalized as a U.S. citizen. This process is known as “extended-family chain migration.”