Use this example to show how Trump has gone against most ‘establishment’ Republicans, who support free trade. The president’s threat to impose trade tariffs on imports chimes more with the progressive Democrats, who fear that existing trade deals harm US workers.
Yet you can also use the example to analyse the power of the presidency. Trump is clearly exercising his informal power of ‘agenda setter’, since threatening to tax car imports from Europe emphasises his promise to put “America First”. Yet the president only has authority to impose tariffs due to Congressional approval, which could always be taken away from him. Will the GOP in Congress stand up to him?