The phrase “chain migration” was rarely used publicly until President Trump began portraying immigrants as bad for the country. He is using the phrase to refer to “family reunification immigration.” For example, after First Lady Melania Trump, who was born and raised in Slovenia, married President Trump and became a U.S. citizen in 2006, after which she promptly petitioned for her mother, father and older sister to move to the United States and become permanent residents.  Melania’s relatives were admitted to the country and moved into Trump Tower. But this type of familial immigration — beyond a person’s spouse and children, and inclusive of parents, siblings aunts and uncles — is what President Trump is now deriding as “chain migration,” and arguing that other people should not be eligible for it. He uses the phrase to sway public opinion against immigrants.