I would venture to suggest that Trump may cobble together coalitions on every issue. I can see him cobbling together a coalition of Democrats and Republicans to "fix" Obamacare, even if it pretends to "repeal and replace" it. The key would be to wrap it up in a label where Republicans could bask in the glory of being "problem solvers". I believe that as time goes by, folks view Obamacare as the status quo, and even Republicans have benefitted from (and secretly approved of) some of the aspects of Obamacare that benefit them (e. g. letting your kids stay on your policy until age 26).
On foreign policy and trade, I can see Trump prevailing with coalitions of liberal Democrats and non-interventionist Republicans. The same would be true of corporate bailouts. (These, by the way, are issues on which Mike Pence sides with Trump.) If Trump is elected, he would have a mandate to do these things, and members of both parties, often with different reasons, are willing to go along with each other on these issues.
Politics is not always logical. This election is being fought on issues where the left (Sanders) and the right (Trump) converge. If Trump is elected, I would predict an end to the kind of gridlock we have had, and a return to pragmatic coalition-building, either because of Trump, or in spite of him. We'll see. I do believe that the cycle of rigid partisanship we have had is coming to a close. We won't have folks calling each other RINOs and DINOs much in the next 10 years.
Have you seen anything at all coming from The Donald's mouth that indicates an understanding of, let alone a willingness to form, political alliances and compromises? If you ask Trump basic questions like, "Can a President introduce a bill to Congress," or "what are Congressional committees for," or "how does a bill become a law," do you think he would be able to provide a correct answer?
