Obama warns of 'strange and uncertain times' in Mandela tribute

Changing times: Obama warned of the "politics of fear and resentment" in the annual Nelson Mandela lecture in Johannesburg

Former US president Barack Obama on Tuesday used a tribute to Nelson Mandela to warn that the world had plunged into "strange and uncertain times", in what is likely to be seen as a veiled attack on Donald Trump.

Obama made no direct reference to his successor but warned that "politics of fear and resentment" were spreading, driven by leaders who scorned facts and told lies with an "utter loss of shame".