Obama to Begin Third Full Day at G20 Summit.
WHITFIELD: President Barack Obama set to begin his third full day at the G20 Summit in China. He and China's President are dealing with some rather thorny diplomatic issues including trade and China's expanding military presence especially in the South China Sea. Before he left, President Obama sat down exclusively with CNN's Fareed Zakaria and talked about how China must accept more responsibility along with its increasing power.</s>BARACK OBAMA, PRESIDENT OF THE UNITED STATES: If you sign a treaty that calls for international arbitration around maritime issues, the fact that you're bigger than the Philippines or Vietnam or other countries in and of itself is not a reason for you to go around and flex your muscles. You've got to abide by international law. And part of what I tried to communicate to President Xi is that the United States arrives at its power in part by restraining itself. And when we binds ourselves to a bunch of international norms and rules, it's not because we have to, it's because we recognize that over the long term building a strong international order is in our interests, and I think over the long term will be in China's interest as well.</s>WHITFIELD: President Obama is also dealing with some simmering tensions between the U.S. and China simmer (ph) accusing China of giving the president a pretty bare bones welcome when he landed a short time ago. A short time after that rather, tensions boiled over between members of the president's entourage and Chinese officials over security access for journalists and state department staff.</s>WHITFIELD: All right, so now it's time to take a look at this week's CNN hero, Shara Fisler, who's introducing students from high-poverty neighborhoods in San Diego to a possible career in science.</s>SHARA FISLER, CNN HERO: These are barnacles and they attach with their heads. You can study technology, engineering, mathematics all through studying the ocean. This is a career field that students from very diverse communities don't pursue, and our students are pursuing them at unprecedented rates.</s>WHITFIELD: All right. To find out more, go to cnnheroes.com and this is the last weekend to nominate someone you know as a 2016 CNN Hero as nominations close Monday night. That's going to do it for me. Thank you for being with me all day long. The next hour of the CNN News Room continues right after this.