The statement papered over deep division between member nations, including Mr. Trump's opposition to the Paris climate accord.
They paraded with signs attacking Trump and the International Monetary Fund, whose largesse is keeping Argentina afloat at the cost of hard-hitting austerity measures. We therefore support the necessary reform of the WTO to improve its functioning.
Shannon O'Neil, an expert on global trade at the Council on Foreign Relations, said she believes it "very likely" that the tariffs will take effect in January.
The United States is unhappy with what it says is the WTO's failure to hold Beijing to account for not opening up its economy as envisioned when China joined the body in 2001.
The statement acknowledges flaws in the world trading system and calls for reforming the World Trade Organisation (WTO) - but does not mention protectionism because negotiators said the USA had resisted that.
The G20 is made up of the world's 19 biggest economies and the European Union.
Meanwhile, the US reaffirmed its intention to withdraw from the Paris climate accord as other members of the group repeated their commitment to implement the Paris deal, taking into account their national circumstances and relative capabilities.
The Trump administration ordered a review of the retaliatory auto tariffs enacted by China and singled out General Motors suggesting they could have prevented the layoffs and plant closures by following the businesses practices of other vehicle companies.
The 20 government leaders - as well as representatives of other invited nations and global institutions - were welcomed on stage at the Costa Salguero Center, the venue for the 13th G20 summit, on the shores of the Rio De La Plata.
While Trump canceled his meeting with Putin, the USA president was still scheduled to meet with China's Xi, but analysts were not optimistic about prospects for a major breakthrough on their countries' trade disputes a month before US tariffs on Chinese goods are set to ramp up.
"I express my heartiest thanks to you (President Xi) for taking out time for this meeting", he said.
Applause rose up in the hall on Saturday as the leaders signed off on a final statement at the end of a two-day summit.More news: MS senator banking on boost from Trump rallies
More news: Jose Mourinho - Manchester United need to handle pressure at home matches
More news: Holly Willoughby catches the sun after I'm A Celebrity debut
USA and Chinese officials have been working for weeks on the contours of a possible deal for the two leaders to be announced following their dinner on Saturday on the sidelines of the Group of 20 summit in Argentina and a road map for talks to follow.
In tweets on Thursday afternoon, US President Donald Trump abruptly called off a planned meeting with Russian President Vladimir Putin over Russia's seizure of Ukrainian navy ships in disputed waters off the Crimean peninsula on Sunday.
Saudi Arabia's de facto ruler, who arrived amid controversy over the murder of Saudi journalist Jamal Khashoggi, has been ignored by other leaders at public events, although he has had a series of bilateral meetings with them in private.
Saudi Arabia has insisted the prince had no prior knowledge of the killing.
The leaders - 35 men and two women - posed for the "family photograph" traditionally taken at G20 gatherings, before heading to the plenary chamber room for initial round-table discussions, to be followed by a series of one-to-one conversations between leaders in the center's maze of meeting rooms. It cited tensions over Chinese technological development, a focus of USA concern. Saturday's talks between the Chinese leader and Trump could prove a test of the pair's personal chemistry.
Trump declares it a victory on behalf of the United States workers he claims were cheated by Nafta.
"We've just gotten to know each other and, so far, so good", was his estimation of Mr Morrison from the outset, before adding "I think it's going to be a great relationship". I think we'd like to.
The officials spoke on condition of anonymity to discuss the ongoing closed-door discussions.
Wang Xiaolong, a Chinese Foreign Ministry official, said Friday that talks with the USA were still ongoing and added that the two sides were finding more common ground.
Hopes of progress over tariffs in Mr Trump's expected talks with Chinese leader Xi Jinping have been dampened.
Earlier this month the Trump administration accused China of not changing its "unfair" practices.
"But in terms of doing a deal. that's entirely up to the president of the United States and the president of China". The two countries went to war over the South Atlantic archipelago in 1982.
In a speech to fellow G20 leaders, Xi said that the major economies "should firmly uphold free trade and the rules-based multilateral trading system".