US Homeland Security Secretary Kristi Noem has said the entire US-Mexico border will wall will be painted black to make it hotter and harder to climb.
She credited that idea to President Donald Trump.
While domestic detentions and deportations have been the primary focus of the current immigration crackdown, Trump's policy bill passed earlier this summer also allocated $46 million for additional wall construction.
Ms. Noem said about a half mile of wall is going up each day along the nearly 2,000-mile border.
The number of border crossings has plummeted in recent months, and the Trump administration says sweeping arrests and detentions are acting as a deterrent to illegal migration.
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