Leaders of the G20 nations are in the Chinese city of Hangzhou for a two-day summit to find ways of boosting global growth.
Chinese President Xi Jinping is hosting the meeting for the first time, his country’s highest profile event of the year.
The G20 is UK prime minister Theresa May’s first international summit after Britain voted to leave the EU, prompting her predecessor to resign.
The US and China have planned on having what Obama said would be candid talks during his visit.
Barack Obama says Britain was wrong to vote to leave the EU at G20 summit https://t.co/WZ5AMcNwsm— Telegraph News (@TelegraphNews) September 4, 2016
On Saturday, Chinese and US officials had a tense exchange on the tarmac just after Air Force One touched down in Hangzhou.
Security has been extremely heightened in Hangzhou with parts of the city of 9 million people turned into a virtual ghost town as China seeks to ensure the summit is incident free.