Lizbeth Polo Smith, an undocumented immigrant from Peru living in Connecticut, hasn't been able to return to her home country since moving to the U.S. more than a decade ago. On Saturday in Miami, she finally reunited with her son.

The immigrants in question were from countries of concern to national security or with high rates of immigration fraud who had pending deportation orders.

Thousands of U.S. agents already patrol the border region where billions of dollars have been spent.

Fleeing violence and poverty, immigrants from Central America's Northern Triangle - El Salvador, Guatemala and Honduras - continue to arrive in the U.S. by the thousands. First, they are processed by Border Patrol. Within 72 hours they are handed over to Immigration and Customs Enforcement or the Department of Health. Some are detained but all are put in deportation proceedings. Those who are released to await the outcome of their cases continue their journey in the U.S. Recent changes allow immigrants to avoid risking their lives on the journey north and to instead submit asylum requests from their home countries.

Marco Gutierrez, a Mexican immigrant, told MSNBC Thursday night about what he thinks will happen if the U.S. doesn't do something about undocumented immigration.

Several prominent Latino Republicans expressed their frustration after hearing the Republican candidate's speech in Phoenix Wednesday.