Now he's got another historic notch on his belt, the longest-ever government shutdown — an impasse that marks a new low for Washington dysfunction.President Trump says he will likely declare a national emergency at the southern border if Democrats don't agree to provide $5.7 billion for a border wall. It would allow the president to divert funds from the Department of Defense to help pay for construction.The dispute triggered by Trump's demands for billions of dollars to finally make good on an unfulfilled campaign promise — to build a border wall — began so long ago that Republicans had a monopoly on Washington power. The Democratic takeover of the House has deepened the disconnect, and with neither side willing to fold, nearly 22 days in, there is still no end in sight.