In his first post-presidency speech, former US President Barack Obama announced he wants to spend the next phase helping "prepare the next generation of leadership".
Obama was speaking to students at the University of Chicago, where he used to be a lecturer, after a three-month time-off.
He expressed confidence that America's problems could be solved; however, the Democrat refrained from commenting on Donald Trump.
The USS Michigan, an American nuclear-powered guided-missile submarine, has arrived in Busan, South Korea in what US officials have described as a show of force amid escalating US-North Korea tensions.
The submarine's arrival also comes amid concerns of another North Korean missile or nuclear test.
The submarine's deployment follows that of the aircraft carrier USS Carl Vinson.
French presidential candidate Marine Le Pen announced she is stepping down as leader of the far-right National Front; however, she indicated the move will be temporary.
The decision is being seen as an attempt to garner votes from supporters of the candidates defeated in the first round.
Le Pen will face centrist Emmanuel Macron in the second round.