Major trading partners of the United States have vowed to respond to Donald Trump's "liberation day" tariffs, amid concerns they will have negative economic impacts around the world. The US president is expected to announce sweeping import duties on many global economies around 7am Thursday AEDT for immediate effect. They will follow levies already in place on steel, aluminium and cars for some countries, prompting alarm among world leaders about how far the US could go. Many countries have already set out how they are likely to react. Amid frantic election campaigning, both sides of Australian politics have remained united…