The debate over illegal immigration has continued amongst the fear of potential terrorist attacks in the wake of the September 11 attacks in 2001 and the lack of an effective Mexico – United States barrier . President Donald Trump enacted a travel ban from seven Muslim-majority countries which had been identified by Obama as countries of concern , which was struck down as unconstitutional and replaced by a " watered down , politically correct version " . During his successful election campaign , Trump promised to make Mexico pay for a new border wall . The federal government entered a partial shutdown from December 22 , 2018 to January 25 , 2019 in a standoff over Trump 's demand for $ 5.7 billion in funding for the wall
September 11 attacks
September 11 attacks
Illegal immigration to the United States