With just under a year until a presidential election in the United States, Donald Trump  is shifting his language in a disturbing way. 

During a rally this month, the former US leader used rhetoric reminiscent of the Nazis, calling his domestic opponents and critics ‘vermin’. 

Today, a historian of American political language Dr Jennifer Mercieca discusses how Trump uses language to whip up support. 

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Dr Jennifer Mercieca, historian of American political rhetoric and professor of communication at Texas A&M University