Trump confirms meeting with China's Xi on Saturday

Chinese President Xi Jinping and other leaders from the BRICS group of leading emerging economies, Brazil, Russia, India, China and South Africa, all called for an opening of worldwide trade and a strengthening of the World Trade Organisation (WTO).

After Trump, Trudeau, and outgoing Mexican President Enrique Peña Nieto each signed their copy of the agreement, Trump held his up and said: 'We might as well hold that up'.

The day will also see a highly anticipated meeting between USA president Donald Trump and Chinese leader Xi Jinping, whose nations have been embroiled in an escalating trade war with new U.S. tariffs on Chinese goods set to take effect a month from now.

That had led to greater confidence among some advisers that Saturday's dinner with Xi could produce a breakthrough, even though no official has been willing to explicitly say they expect the two men to come to an agreement.

Diplomats from the G-20 countries were haggling hard over a final joint statement, with disagreement over what language to use on the Paris climate accord and the World Trade Organization.

Macron said the crown prince only "took note" of his demands.

"I expect (US President Donald) Trump to be very warm with him, but European leaders probably are going to be very reluctant to have their pictures taken with him".

He said cooperation with the United States would serve in the interest of "peace and prosperity".

China also pushed back in talks on steel, South Africa objected to language on trade, Australia did not want the statement to be too soft on migration and Turkey anxious it would push too far on climate change, according to the officials.

They spoke on condition of anonymity because they weren't authorized to speak publicly about the closed-door discussions.

"If we could make a deal, that would be good", he said on Friday.

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"We ratify the concern of everyone over climate change".

"Australia has always been a successful trading nation and that's how we will continue to ensure the prosperity for our people", Morrison told reporters after landing in Buenos Aires on Friday morning.

The foreign minister, Chrystia Freeland, said the three countries were "very much on track" to sign on time. The White House has sent mixed messages about USA expectations for Saturday's meeting, with economic adviser Larry Kudlow expressing cautious optimism earlier in the week, saying that while Trump was eager to work toward a deal with China, he couldn't rule out that talks could be derailed if Xi's offer wasn't substantive enough.

Their declaration was meant to encourage other G-20 members to do the same, and to provide a boost for an upcoming United Nations climate summit.

The G20 world leaders are now gathered in Buenos Aires for the 2018 summit which aims towards reaching agreement on key global issues.

The summit is meant to focus on issues such as labor, infrastructure, development, financial stability, climate sustainability and global commerce.

The US is one of 147 Paris Agreement signatories, and would be the first to back out. In doing so, they cited the trade conflict as well as political uncertainty.

Highlighting the deep rifts within the G20, European Council President Donald Tusk said the European Union would extend its economic sanctions on Moscow next month, after Russian ships fired on Ukrainian ones in the Sea of Azov last week, seizing the boats and sailors.

Also expected to loom large amid dozens of bilateral meetings in Buenos Aires: the gruesome slaying of Khashoggi in Saudi Arabia's Istanbul consulate and how the Saudi crown prince, who is alleged to have ordered the killing, is received by world leaders.

French President Emmanuel Macron said he told the prince in a separate meeting that Europeans will insist on global experts being part of the investigation into Khashoggi's killing, Reuters reported. According to Reuters, audio caught bin Salman telling Macron not to worry to which Macron replied, "I am anxious".

The presence of Crown Prince Mohammed bin Salman at the summit also raised an awkward dilemma for leaders, and Saudi Arabia's de facto leader cut a lonely figure standing at the edge of the G20 family photo. A weaker yuan lessens the impact of USA tariffs on Chinese exporters.