The barrier is US immigration law. The barrier is that their parents put them in a terrible situation. There will be no amnesty without border security. It's been promised, but never delivered. Maybe the arrogance of these illegal immigrants is coming back to haunt them. Marching with Mexican flags and demanding special treatment from a country that they shouldn't even be in is finally creating the backlash it should. Critics, like this poster, continue to label American citizens as racist and bigots. For what? Wanting the law followed. If congress fails to act, the only thing you can do is follow existing law. Name calling and acting like somebody owes you something will only strengthen the resolve of the people that disagree with you. If the children stay, the parents should be deported.