How Trump’s national security threat to build wall would face legal challenges

President Donald TrumpPresident Trump says he’s considering inflating what he claims is a crisis into a national emergency so he can find a way to build a wall at the US-Mexico border that Congress has so far refused to fund. The federal government remains in a partial shutdown over the $5 billion the Trump administration is holding out for to fund construction of the wall. Reuters has more on the twin legal challenges the Trump administration is likely to face if it decides to declare the situation a national emergency to circumvent congressional funding.