At the G-20, Trump warns on election meddling -- with a grin

In Japan, President Trump warned Russian President Vladimir Putin and his staff not to meddle in the 2020 election, but he did so with a grin. Although G-20 summits have historically been calm conferences, President Trump has made them less predictable. He will finish his trip to Osaka with a pivotal meeting with Chinese President Xi Jinping. Nick Schifrin reports.