The Department of Homeland Security will use the tests to identify what it calls fraudulent families. But advocates say the plan raises privacy concerns.
Protesters took to the streets at more than 140 events across the United States on Monday to oppose President Donald Trump's declaration of a national emergency on the country's southern border.
Within hours of Trump declaring a national emergency on the border, the ACLU announced it would sue the president to prevent him from using military funds to pay for border wall construction.