Why has Trump ordered ‘powerful strikes’ in Nigeria?

Missiles are shown erupting from a US warship in a video accompanying words by Donald Trump hailing a strike on ISIS in Nigeria (Picture: US Department of War)

Donald Trump has hailed ‘powerful and deadly’ US strikes carried out on Christmas Day against an Islamic State branch in Nigeria. 

The US president said ‘perfect’ hits had been carried out against ‘ISIS terrorist scum’ in the operation targeting camps run by the group in the country’s north-west. 

The Pentagon reported...