But these beliefs have been core to the American left for decades. Even left wing intellectuals like Noam Chomsky have attacked the neoliberal trade agreements I think.
Trump’s populist right wing fans have adopted traditionally left wing views. What’s surprising is so many left wing people are supportive of free trade when they were against free trade during the Reagan era.
I don't think the left has been automatically in favor of tariffs--or at least I'd appreciate evidence for that claim. The complaints about free trade deals that I've seen have tended to be about provisions that treated various labor and environmental regulations as restraints on trade. It's fair to say that left-liberal people are paying more attention to the downsides of tariffs than they were, but I don't think it's a simple reversal of positions.
I’m not sure what your sources are but if Bernie Sanders is the left, then he’s been saying the same thing for a long time and continues to. Maybe there’s some nuance to it?
Trump’s populist right wing fans have adopted traditionally left wing views. What’s surprising is so many left wing people are supportive of free trade when they were against free trade during the Reagan era.