The only response to this is for every single country impacted by this which is everybody to impose reciprocal tariffs on the US and do thr same with any retaliation.
Trump is banking on being able to freely throw his weight around and other countries just taking it. the response needs to be firm, no fannying around, take canadas lead and hit them straight back.
The US tresury secretary has already warned against retaliatory tariffs strongly advising against it and threatened escalation, i wonder why that is? He knows they'll be absolutely fucked if everybody retaliates.
The whole world will suffer from a trade war, nobody with any sense wants it but the US have already entered into one here. It's no longer avoidable and there has to be a response. The US will suffer hardest if everything they import and export is subjected to tariffs. If their cost of living jumps a minimum of 10% and more likely to be 20-30% if not higher overnight, how long will they put up with that?
The rest of the world will hurt too whilst they adjust but we'll find other trade deals and learn to be less reliant on US.