Donald Trump tweets he will not impose tariffs on "the great nation of Australia"

Consider the below information lifted from the DFAT website and then consider that economic theory states that import tariffs will make your own industry noncompetitive economically with the rest of the world's industries. Also consider that Australia only exports $12m of goods to the USA per year (not much of it steel or aluminium) yet the USA exports $30m of goods to Australia. So armed with this information, who do you think will be hurting the most from a tariff war with the rest of the world and was probably reminded of this by other heads of state? A "Very Stable Genius", that's who. If back-pedaling was an Olympic sport he'd be in the running for gold.