What does President Trump's declaration of a national emergency mean for the country? (Amy B. Wang)

With 16 states, the ACLU, the Sierra Club and the Southern Border Communities Coalition all suing President Trump in at least four different lawsuits over his declaration of a national emergency over what he describes as "illegal immigrants streaming across the southern border," this appears to be yet another battle headed for the Supreme Court. On this week’s TrumpWatch, Washington Post reporter Amy B. Wang unpacks what the President declaring a national emergency means in both the long and short term.