However, concerns remain over the differences between the official statements released by the two countries. "We just said, 'You have 90 days to do several things'".
The tariffs were also imposed to try and force China to make changes to their economic practices, specifically the theft of U.S. intellectual property.
"While we hope that talks with China will achieve meaningful results for USA workers, we urge you to not back down for the sake of a weak and meaningless agreement should China fail to make real concessions", the Democrats wrote.
However, Qualcomm said in a statement that it considers the matter closed.
China said last week that tariffs on USA autos would be 15 percent if not for the trade dispute, and it called for a negotiated solution. Trump also canceled a Saturday news conference, citing respect for the Bush family following the death of former President George H.W. Bush.
The Great Leap Forward was a cornerstone of Chairman Mao Zedong's move toward a socialist economy by requiring farmers to "collectivize" their property and operations, and by forcing farm workers to take industrial jobs.
The United States and European nations have also long accused China of forcing foreign firms to transfer their know-how to local partners in order to do business in the country.
Beijing had reduced auto import duties from 25 percent to 15 percent in July.
If China and the USA fail to reach agreement in 90 days, the US will raise the 10% tariffs to 25% and may move forward on additional tariffs.
Discussions were to begin immediately, with the goal of an agreement within 90 days.
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USA exports of cars and light trucks to China were worth $9.5 billion in 2017 and have dropped off significantly since China imposed its retaliatory tariffs over the summer that gave exporters in Europe and Japan a significant advantage.
What else happened in Buenos Aires?
"He's the toughest negotiator we've ever at the USTR and he's going to go chapter and verse and get tariffs down, non-tariff barriers down and end all these structural practices that prevent market access", White House trade adviser Peter Navarro told National Public Radio earlier on Monday.
Joining other forecasters, economists at the Organization for Economic Co-operation and Development last week downgraded their outlook for global economic growth next year to 3.5 percent from a previous 3.7 percent. But both leaders still face a complicated mix at home of economic nationalists, free trade advocates and other conflicting forces.
Fentanyl and other synthetic opioids now rank as the deadliest abused drug in the USA, accounting for nearly half of the more than 70,000 overdose deaths in 2017, according to the Centers for Disease Control and Prevention.
Trump's tweet did not give any further detail about the tariff cuts, such as when the deal had been reached or a new level for the Chinese levies.
The White House called the meeting "highly successful", citing Trump's statement that: "This was an fantastic and productive meeting with unlimited possibilities for both the United States and China".
The US simultaneously threatened to add tariffs to a further $267 billion (£205 billion) of products.
Similar to crude, no USA cargoes of LNG - which is subject to Chinese tariffs - arrived in China in October, although two were discharged in November. President Xi attended a working dinner with President Trump in Buenos Aires on Saturday. He said there were three sites under consideration, but he declined to name them.
Trump claimed Russian Federation violated the agreement and said China doesn't have to abide by it.