WASHINGTON - Republican Senator Lindsey Graham said on Thursday that President Donald Trump should declare a national emergency and bypass Congress to fund a wall on the US border with Mexico. House Speaker Nancy Pelosi's 'refusal to negotiate on funding for a border wall/barrier - even if the government were to be reopened - virtually ends the congressional path to funding for a border wall/barrier,' Graham said in a statement. 'It is time for President Trump to use emergency powers to fund the construction of a border wall/barrier,' he said.