Trump did not get a marginal win it was a landslide, what he says and what actually happens is not always the same thing, by being protectionist the risk is controlling inflation. Government borrowing in the US is very high, much higher than the UK, he does need to control or reduce that if he does not the dollar could well loose value quickly.
The US could produce much more of their own needs at home without buying overseas, currently it’s cheaper to import, but that’s at the expense of their own manufacturing industry. The EU is in same position it doesn’t want to damage its
manufacturing base or food production and be dependant on imports. The UK seems to be heading in the opposite direction, no Tariffs yet pursuing an environmental agenda to lower emissions, yet inevitably increasing imports, greenwashing?
Just like the UK he wants to control migration, the US needs migrant workers as we do, I dont see anything wrong with that policy in the UK or US, nor do a great many Latinos, they don’t want uncontrolled migration risking their jobs, As for welfare spending were not going to see mass starvation in the US
We should worry if he is successful because the dollar will get stronger and our imports will get more expensive