The move drew immediate bipartisan criticism on Capitol Hill and is expected to face rounds of legal challenges.
There is a law that Congress passed back in 1976 that sets out how a president can declare a national emergency, and how Congress can end that national emergency by legislation.
The law doesn't set many limits on how a president can declare a national emergency, or for what reason. The president just has to do it publicly and then periodically report back to Congress about the ongoing emergency.
Trump's Emergency Declaration
Washington: President Donald Trump declared a national emergency Friday to fulfill his pledge to construct a wall along the US-Mexico border.
Courtesy: APTN
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(With inputs from APTN)