John Burnett, NPR

NPR National Correspondent

President Trump's "zero tolerance" practice of 100 percent prosecution was modeled after an earlier get-tough policy on the Southwest border called Operation Streamline. It was supposed to streamline the process for punishing unauthorized immigrants and deter people from jumping the border.

The Berduo family traveled nearly 2,000 miles from Guatemala to the international bridge between Matamoros, Mexico, and Brownsville, Texas, but they could go no further.

Under a new policy, federal border agents stationed in the middle of international bridges are turning away asylum seekers like the Berduos, telling them there is no room in U.S. Customs and Border Protection stations for them.

The shooting death of an undocumented woman at the hands of a U.S. Border Patrol agent in Rio Bravo, Texas, near Laredo, Wednesday is ratcheting up tensions along the U.S.-Mexico border.

According to a statement released by Customs and Border Protection, a lone agent was responding "to a report of illegal activity by Centeno Lane ... where he discovered a group of illegal aliens" just after noon.

The statement adds:

President Trump's chief of staff, Gen. John Kelly, said he has never seriously considered leaving his job and indicated that he's in lockstep with the president on many issues. Kelly says they have "a close relationship" and spend up to eight hours a day together.

"My view is to speak truth to power. I always give my opinion on everything. He always listens," he said. "Sometimes he takes the opinion, sometimes he doesn't."

The Trump administration regularly asserts that undocumented immigrants are predatory and threaten public safety. Immigrant advocates say that talk demonizes an entire class of people.

Now, four academic studies show that illegal immigration does not increase the prevalence of violent crime or drug and alcohol problems. In the slew of research, motivated by Trump's rhetoric, social scientists set out to answer this question: Are undocumented immigrants more likely to break the law?

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