G20 sources said climate change was emerging as the biggest stumbling block to agreement on a joint communique in Buenos Aires when the summit concludes on Saturday.
The weekend summit is confronted with increasingly dire warnings by the International Monetary Fund (IMF), among others, of the potential harm faced by the world economy from the tussle between top economies of the world.
But don't expect the president to emerge from his dinner with Xi or his private chat with Putin and announce a trade pact or that Russian Federation has agreed to cool its aggressive actions in Ukraine or Syria.
Despite the president's positive attitude, financial analysts and experts have painted a different picture of the ongoing trade dispute with Beijing. And there will be face-to-face talks with Turkish President Recep Tayyip Erdogan, who has been much more critical than Trump of Saudi Arabian Crown Prince Mohammad bin Salman after Washington Post journalist Jamal Khashoggi was killed at the Saudi consulate in Istanbul.
Nonetheless, French president Emmanuel Macron, who flew into Buenos Aires on Wednesday, clung to the importance of the ideal of cooperation that the G20 represents.
"As in the past, I look forward to the opportunity to meet leaders on the sidelines of the summit to exchange views on bilateral matters of mutual interest", Modi had said in his departure statement.
The options for solving the Sino-U.S. problems are all on the table, a Chinese diplomat said in Washington on Wednesday, adding both sides have stepped up communication and he was optimistic about the Xi-Trump talks.
"I probably will be meeting with President Putin".
The administration this summer removed hundreds of items from the list of imported goods subject to tariffs after lobbying from US companies.
"The reason that the small truck business in the U.S.is such a go to favorite is that, for many years, Tariffs of 25% have been put on small trucks coming into our country", Trump tweeted.
First Lady in Virginia for opioid town hall discussion at Liberty University
US First Lady Melania Trump has defended her choice of red Christmas trees after they inspired jokes and memes online. Melania Trump thinks the media should focus on important issues instead of wasting time mocking Christmas decorations.
Trump said earlier this week the chances of holding off a tariff increase to 25% is "highly unlikely", and he repeated threats to impose tariffs on an additional $267 billion of goods from China, which would cover almost all Chinese imports to the U.S.
Just what is the G20?
The G20 finance ministers said they plan to meet on Thursday evening for an annual dinner to conclude the work of the finance track.
The G20 countries are - Argentina, Australia, Brazil, Canada, China, France, Germany, India, Indonesia, Italy, Japan, Republic of Korea, Mexico, Russia, Saudi Arabia, South Africa, Turkey, the United Kingdom, the United States and the European Union.
There will also be a focus on the regulation of crypto-currencies at the Summit this year.
This year, the G20 summit will for the first time ever be hosted by a South American nation.
The plenary session is scheduled to begin at 12:30 p.m. (15:30 GMT) with Argentine President Mauricio Marci giving opening remarks.
When he was elected in 2015, Mr Macri promised market-friendly reforms to get Argentina's isolated economy back on track. It cited tensions over Chinese technological development, a focus of US concern. Trump wants the iPhone made domestically, a massive supply-chain realignment that Apple executives and economists say is not practical.