As the Nobel Peace Prize announcement looms, we revisit the five US leaders honoured, from Roosevelt to Obama, while Donald Trump’s audacious bid for the award reignites global debate.

The Insurrection Act has been used on 30 occasions in U.S. history, according to a think tank. It hasn’t been used in more than 30 years. Seventeen of the country’s 45 presidents, about 37%, have officially invoked it.