Washington, Jan. 11 -- The Trump administration is considering using billions in unspent disaster relief funds earmarked for areas including hurricane-pounded Puerto Rico and Texas and more than a dozen other states to pay for President Donald Trump's border wall as he weighs signing a national emergency declaration to get it built without Congress.

The White House has directed the Army Corps of Engineers to comb through its budget, including $13.9 billion in emergency funds that Congress earmarked last year, to see what money could be diverted to the wall as part of a declaration. That's according to a congressional aide and administration official familiar with the matter who spoke on condition of anonymity because they were not author...