US President Donald Trump has stepped up his war of words with North Korea. After promising “fire and fury”, he is now saying leaders in the communist state should be nervous and need to “get their act together”. Trump insists previous administrations were too soft on North Korea. Al Jazeera’s Mike Hanna reports from Washington, DC. Subscribe to our channel: http://aje.io/AJSubscribe Follow us on Twitter: / ajenglish Find us on Facebook: / aljazeera Check our website: http://www.aljazeera.com/