The Wall for Trump is like Brexit for Theresa May - a disaster. See:

Trump's biggest and most extreme supporters are right by his side in his fight to protect the United States of America from the world's baddies by building a heck of a large wall/barrier along the border with Mexico. But how about the hundreds of thousands of people who are not earning any money because of the government shutdown, and the shopkeepers who aren't able to sell their goods because no one has money to go shopping and the petrol/gas stations that aren't selling petrol/gas etc etc? Soon there will come a point of diminishing return for Donald Trump when praise for his stand against the Democrats in the House of Representatives over the Mexico wall will turn to pure anger over the president's intransigence and seeming uncaring attitude towards the federal workers who are not being paid. It's into the third week and still no sign of any income for the near-million workers and their families. Trump is going over the heads of Congress and appealing to the people tonight when he addresses the nation but I suspect his words will not be soothing. They will be cantankerous and will lead to further division. And still no wall. The trouble is, both Trump and the Nancy Pelosi-led Democrats in the House have put themselves into a corner from which there is no obvious exit. One or other has to give way but there is too much at stake for either to budge an inch. So the federal workers and all the communities which are now suffering have the prospect of weeks and weeks of political gridlock. Who will be blamed, Pelosi or Trump? Trump is the most powerful person in the US - theoretically - but Pelosi has the power to outmanoeuvre him and force him to surrender. The Wall is to Trump what Brexit is to Theresa May. Any way you look at it, it's a disaster for the two countries they lead.