US President Donald Trump has approved the execution by firing squad of Nidal Hasan, a US Army psychiatrist who shot dead 13 people at a military base in 2009, the Pentagon said on Monday. Hasan’s execution for the attack at Fort Hood in Texas – which also wounded more than two dozen people – will be the first carried out by the US military since 1961. Defence Secretary Pete Hegseth “has recommended – and President Donald J. Trump has approved – death by U.S. Army firing squad for convicted...