"To have a lawful system of immigration that serves the national interest, we cannot admit everyone who would like to come here. It's just that simple.
That would be an open-border policy and the American people have rightly rejected that," Sessions said.
In a statement issued by the White House, Trump said, "I do not favor punishing children, most of whom are now adults, for the actions of their parents.
But we must also recognize that we are nation of opportunity because we are a nation of laws."