President Donald Trump has directed the deployment of the US National Guard to Chicago and Portland, cities led by Democratic governments. Despite legal challenges from both states aiming to block the deployment, Trump is considering invoking the 19th century Insurrection Act to bypass these obstacles. Why is the president sending troops onto American soil? What does this historic law allow? Alyson Le Grange explains the situation, the reasons behind the deployment, and its potential impact on these cities.
