Can Congress or the courts reverse Trump’s national emergency?

President Donald Trump declared a national emergency to pay for the construction of a wall along the U.S.-Mexico border, after Congress, in its new spending bill, denied him the full money to build it.

“We’re talking about an invasion of our country with drugs, with human traffickers, with all types of criminals and gangs,” Trump said in a speech on Feb. 15 before signing the declaration.

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