Simply because he’s stacked the SCOTUS with Republicans. This all about the Great Fence of Trump turning America an isolationist invader of other nations. 164 of which have an American military presance today. 59,000 military personnel remain unaccounted for in any records they are being paid and aren’t dead. Then there’s the private mercenary contractors who remain invisible as well. So yes there is a national emergency and it is American. (ODT)

Mr Trump is confident he will win any court challenge

via Donald Trump declares a national emergency over US-Mexico border in a bid for wall funds – Donald Trump’s America – ABC News (Australian Broadcasting Corporation)