I don't agree that it wasn't covered in the 2016 election. It's just that a lot of people who are resentful over the increase in income inequality voted for Donald Trump.
I know there has been the recent analysis of polling indicating that Trump voters didn't vote on the basis of the economic status, but I don't agree with that analysis. I think disentangling resentment over a decline of economic status and resentment of 'the others' is very difficult to do.
I'm not sure what point you're making here.
Trump ran to the right by runnimg to the left. Deregulation helped the minority working poor at the expense of the white working poor and "lower middle class"(people who aren't or never really middle class, but had some money when they were union).
Income Inequality or left-wing concerns can be made a right-wing issue.
Ah, yes I completely agree. Although in Trump's case, he took nearly every side of every issue, so it's difficult to know. If Trump had a philosophy, he seems to most closely resemble (or resembled during the campaign) European far right parties and we see with UKIP and others the appeal they have in declining working class areas.
As I'm sure you know, these far right parties are anti free trade and support social programs (for 'old stock' citizens.) In France, Marine Le Pen ran to the left of Macron on these issues (if being anti free trade is left wing.)