The United States has invited Russian President Vladimir Putin to attend the G20 summit of world leaders being held in Miami in December, US Secretary of State Marco Rubio says. "In order to solve problems, you have to meet with with people you disagree with or the people that you might have some issues with, so we've invited President Putin to the G20. We think it's an opportunity for him to engage not just with the president but with other world leaders. We hope that's an invitation he'll accept," Rubio says.