Deporting 7 million undocumented workers would eliminate $4.7 trillion from the GDP over the next decade, the report said. A second new study also found that immigrants aren't taking Americans' jobs.

An hour and a half before his first day of classes, Eduardo Luján Olivas was told that his $20,000 scholarship was given by mistake and would be taken away. Undeterred, Luján raised even more than he needed through a crowdfunding campaign.

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.