AP Explains: Can Trump declare emergency to build his wall?

The Capitol is seen as the partial government shutdown lurches into a third week with President Donald Trump standing firm in his border wall funding demands, in Washington, Monday, Jan. 7, 2019. After no weekend breakthrough to end a prolonged shutdown, newly empowered House Democrats are planning to step up pressure on Trump and Republican lawmakers to reopen the government. (AP Photo/J. Scott Applewhite)

WASHINGTON — The Trump administration is weighing using a national emergency declaration to circumvent Congress and the budget stalemate and force construction of the president’s long-promised southern border wall.