US President Donald Trump has introduced new tariffs on CHina that bring the total to 54%, and has threatened more if Beijing retaliates with tariffs of its own. Photograph: Kevin Dietsch/Getty Images China has promised to “fight to the end” if Donald Trump follows through on a threat to impose a further 50 per cent tariff on all Chinese imports. The United States president said he would impose the extra levy, on top of a combined 54 per cent in already announced tariffs, if Beijing introduces its threatened 34 per cent retaliatory tariff on US imports. China’s commerce ministry on…