Construction of a wall/barrier along the full length of the U.S.-Mexico border was at the forefront of Trump’s campaign in 2016 but ended up taking a backseat to other issues like healthcare and tax reform during the president’s first year in office. Congress has not been inclined to give the administration more than a few billion dollars at a time for border wall construction.
In the last spending bill, Congress allocated $1.6 billion for wall projects, but Trump is looking for $5 billion this time around and has threatened a shutdown if his administration and lawmakers can’t come to an agreement.