"Who would have thought that Trump is a protectionist leftie?"
I wouldn't. Protectionism is nationalist policy, not left-wing. It's also a policy that would be dumped milliseconds after Trump was elected because he wants to expand his business abroad. The Left is internationalist, and though Marx's Labour Theory of Value is not very good economics, it tends to suggest that the left wing approach would be to only permit the import of goods from countries that pay the workers as well as your own are paid. Yes, China, sell us as many iPhones as you like when your workforce gets a First World living standard.
(I know it is economically impractical and in fact impossible).