One group that Trump has railed against, MS-13, stands to benefit if a large number of Salvadorans are displaced.

WOLA's Geoff Thale and I spoke with Business Insider's Chris Woody in Trump's latest move on immigration will likely empower MS-13 — a group he's vowed to 'destroy.'

El Salvador had 103 homicide for every 100,000 people in 2015, according to UN data. That figure has dropped, and the government has touted the decline, but the country remains the second-deadliest in the world with a homicide rate over 10 times higher than the US's roughly 5 per 100,000, Thale said.

"Insecurity in El Salvador extends well beyond simply the homicide rate, to include high rates of extortion, robbery, theft, all sorts of types of victimization," Allison added.

El Salvador's anti-gang strategy includes important measures like violence prevention and community projects, according to Thale. But in practice, he said, "it's mostly a hardline, zero-tolerance, lock-'em-up and throw-away-the-key, look-the-other-way-if-there's-extrajudicial-executions sort of approach, so it's not an approach that's going to provide additional safety for immigrants moving back to El Salvador."

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