Obamas say Alex Pretti killing a ‘tragedy’ as calls mount for full investigation

Former president and first lady say killing should be wake-up call' and federal agents are not operating in lawful way

Pressure mounted on Donald Trump's administration on Sunday to fully investigate the previous day's killing by federal immigration officers of 37-year-old nurse Alex Pretti in Minneapolis.

Calls for an investigation have come from all sides of the political divide after video analysis showed officers had removed from Pretti a handgun he was reportedly permitted to carry - and which he was not handling - before fatally shooting him.