Texas Rep. Joaquin Castro describes his plans if President Trump declares a national emergency to build his border wall: "We'll challenge him in Congress. We'll challenge him in the courts. And I think the American people will challenge the President."

Texas Rep. Joaquin Castro describes his plans if President Trump declares a national emergency to build his border wall: "We'll challenge him in Congress. We'll challenge him in the courts. And I think the American people will challenge the President." pic.twitter.com/Ftfljd2lHb

— CNN Politics (@CNNPolitics) February 14, 2019