The Department of Defense has reallocated over $600 million from the Afghan National Security Forces to build the wall, following Trump's national emergency declaration.
The ACLU is suing the Trump administration over the president's national emergency declaration.
Environmental law experts say the presidential powers unlocked by declaring a national emergency are the wrong tools for solving the climate crisis.
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.
Challengers to Trump's national-emergency declaration can use his own words against him.
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.
We've highlighted Pacific Standard's best stories on the national emergency over a border wall.
A legal expert on emergency powers weighs in.
While the president has far-reaching powers in a state of emergency, experts say Trump could face legal challenges over specific provisions.
The last time officials declared a nationwide public health emergency in the United States was in 2009, for the H1N1 flu outbreak.