The president tweeted directly to USA farmers, some of whom have suffered as a result of Chinese counter-tariffs, to say "Farmers, I LOVE YOU!"
Chinese officials are puzzled and irritated by the administration's shaky handling of the meeting's aftermath, according to a former USA government official who has been in contact with them.
Stocks fell following Trump's tweetstorm with the Dow Jones industrial average declining almost 3%.
Trump said he and Xi "are the only two people that can bring about massive and very positive change, on trade and far beyond, between our two great Nations. It will always be the best way to max out our economic power", he said on Tuesday.
Markets took a dive following Trump's tweetstorm.
The Dow Jones industrial average sank almost 600 points, or 2 percent, to 25,245.
China's national currency has shot upwards more dramatically over the past two days than over the last decade after the country reached a truce in its trade war with the United States, and in light of a temporary decline in the dollar prices.
Trump repeated on Tuesday that China had agreed to "start buying agricultural product [s] and more immediately", a commitment that was absent from the Chinese Ministry of Foreign Affairs' statement on Sunday.
A lack of detail from the Chinese side has left investors and analysts wondering if Trump's exuberance is warranted, and if details touted by the White House but left out of Chinese reporting on the agreement are in question.
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Following the Trump-Xi talks, which took place over dinner at the end of the G20 summit, Washington agreed to hold off on Trump's threat to slap 25 per cent tariffs on Dollars 200 billion worth of Chinese goods from January 1, leaving them at the current 10 per cent rate. The Chinese Foreign Ministry says Trump and President Xi "reached consensus not to impose new additional tariffs and agreed to instruct the economic teams of the two sides to step up negotiations toward the removal of all additional tariffs"-closer to Trump's claim, but nowhere near as certain".
The president confirmed that Bob Lighthizer would lead the negotiations with China with assistance from Treasury Secretary Steve Mnuchin, Larry Kudlow, Wilbur Ross, and Peter Navarro.
"If it is, we will get it done".
This was also the first time that the president suggested the negotiating window could be extended.
"Every time we covered this kind of bilateral meeting we had no detailed information from the Chinese side", she said, adding that Chinese media were only allowed to publish the reports of state news agency Xinhua.
"I$3 f a fair deal is able to be made with China, one that does all of the many things we know must be finally done, I will happily sign", he explained. Let the negotiations begin.
President Trump's economically illiterate trade commentary won't help - and is driving American allies to ramp up their own trade barriers to retaliate.
Trump addressed one of the concerns by indicating he would not be opposed to extending the 90-day truce. "This agreement is a short-term alleviation of trade tensions, but we caution that this is a reprieve rather than a resolution".