Obama sings Rihanna's 'Work', slams Trump
US President Barack Obama on Thursday appeared on the television show 'The Tonight Show' 'singing' about his achievements during his term, while mimicking some lyrics from Rihanna's single 'Work', alongside the host Jimmy Fallon. Obama also indirectly slammed the presumptive Republican nominee Donald Trump for being critical of his foreign policies.  "Orange is not the new black," quipped Obama.