Canada's Prime Minister Mark Carney has come out swinging, outlining a major retaliation against US President Donald Trump's latest wave of tariffs. The two neighbours have been spiralling towards an escalating trade war since negotiations collapsed last week. But could Canada’s response inspire other countries like Australia to push back against Trump's tariffs too? Today, David Smith from the United States Studies Centre on Mark Carney's defiance against the US and whether we should follow suit.  Featured:David Smith, Associate Professor of US Studies at the United States Studies Centre