<div>China has filed a complaint with the World Trade Organisation, WTO, challenging US President Donald Trump's tariff hike on imported steel and aluminum.&nbsp;</div>''<div><br />''</div>''<div>The trade body said today that China has requested 60 days of consultations with the US on the steel and aluminum dispute.&nbsp;</div>''<div><br />''</div>''<div>If that fails, the next step could be for Beijing to request a ruling from a panel of trade experts.&nbsp;</div>''<div><br />''</div>''<div>Beijing says Trump's decision to impose additional duties of 25 per cent on steel and 10 per cent aluminum violate international trade rules. <br />''</div>