How white supremacist mass murders have become an organised transnational security threat.
A shocking photo of the lifeless bodies of Oscar Alberto Martinez, 25, and his 23-month-old daughter Angie Valeria lying face down in the river fuelled global outrage, with some people blaming US crackdown on border crossings for their deaths.
The biggest US political debate since the 2016 presidential campaign is occurring over two nights in Miami, climaxing with former vice president Joe Biden squaring off against nine challengers, including number two candidate Bernie Sanders.
Trump says barriers turned El Paso from one of the nation's most dangerous cities to one of its safest, but the city had a murder rate less than half the national average in 2005, a year before the most recent expansion of its border fence.
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