Trump is a strong supporter of single payer health plans and this is from Trump himself and not the Washington Post.  He has said this several times using Canada, Australia, and Germany as examples. Several people in his campaign, like his speech writer, and his Alt Right (far right conservatives) supporters joined him in supporting single payer. He made a statement for universal health care after the election-- health care for all regardless of whether they could afford it or not. As to the wall-- Congress will need to approve funding and it has not yet-- not the government of Mexico who has said it will not pay. Mexico and NAFTA have gained big time US political support from big Republican and conservative donors who do business with Mexico selling and buying-- they  strongly oppose the wall. Notice Trump backing away from abolishing NAFTA because it will lose way more US jobs than keeping it.