Support for building a wall on the border, which is the principal sticking point in the stalemate between the president and Democrats, has increased over the past year. Today, 42 percent say they support a wall, up from 34 percent last January. A slight majority of Americans (54 percent) oppose the idea, down from 63 percent a year ago.

The increase in support is sharpest among Republicans, whose backing for Trump’s long-standing campaign promise jumped 16 points in the past year, from 71 percent to 87 percent. Not only has GOP support increased, it has also hardened. Today, 70 percent of Republicans say they strongly support the wall, an increase of 12 points since January 2018.

Concerning the allocation of blame, 53 percent say Trump and the Republicans are mainly at fault, and 29 percent blame the Democrats in Congress. Thirteen percent say both sides bear equal responsibility for the shutdown. That is identical to the end of the 16-day shutdown in 2013, when 29 percent blamed then-President Barack Obama and 53 percent put the responsibility on congressional Republicans.