Democratic lawmakers gathered for Tuesday's State of the Union address twice booed President Trump as he spoke about restricting family-based chain migration to the U.S.

"Under the current system, a single immigrant can bring in virtually unlimited numbers of distant relatives," Trump said, advocating for an immigration plan that extends visas exclusively to the "spouses and minor children" of current legal immigrants.

The president also criticized chain migration patterns while offering his condolences to the parents of two 16-year-old girls who were murdered by MS-13, a predominantly Latino transnational criminal organization. Many members of the criminal gang have been permitted entry into the U.S. through "deadly loopholes" like the visa lottery system, Trump said.

Democrats loudly booed the president at both mentions, though they stopped when the president turned his attention to the parents of the slain teenage girls.