"We'll be discussing trade and I think at some point we are going to end up doing something great for China and great for the United States", Trump said.
Even as Trump appeared to soften his approach to China, he talked tough on a separate trade front. Trump left immediately to board Air Force One for Washington, having spent two days attending the summit of G20 countries.
The temporary ceasefire in the U.S. "China is unlikely to compromise on this issue", the professor noted.
Trump agreed that on January 1, 2019, he will leave the tariffs on $200 billion worth of product at the 10% rate, and not raise it to 25% as he previously committed.
Despite months of complaints by the United States and the USA imposing tariffs on about $250 billion worth of Chinese goods, Beijing "has not fundamentally alerted its unfair, unreasonable, and market-distorting practices", according to a report issued last week by Lighthizer. There was no mention of that threat in the White House account of Saturday's talks.
Ahead of what was seen as the most important meeting of US and Chinese leaders in years, both sides said differences remained, and the outcome of the talks were uncertain.
China will import more marketable products from the United States in efforts to gradually ease imbalances in two-way trade, said Wang.
China "is open to approving the previously unapproved" deal for USA company Qualcomm Inc (QCOM.O) to acquire Netherlands-based NXP Semiconductors (NXPI.O) "should it again be presented". Trump and the leaders of those countries signed an updated trade deal, the U.S. -Mexico-Canada Agreement, or USMCA, at the G-20.
The reform was backed on Saturday amid growing global trade tensions.
On Climate change, the U.S once again maintained its decision to withdraw from the Paris Agreement, while other members of the group affirmed their commitment to implement the agreement.
The G20 sees the multilateral trading system is "currently falling short of its objectives and there is room for improvement", the document showed, adding it pledged to "use all policy tools to achieve strong, sustainable, balanced and inclusive growth".
Contrary to their treatment of the United States, the G20 leaders placed a requirement on China.
"It's a pity that we weren't able to have a real meeting".
Prior to having dinner with Trump, Xi said he was "very happy" to have an opportunity to address issues with the United States leader.
Trump described the meeting with Xi as "amazing and productive". After negotiations led by their subordinates ran aground, Trump telephoned Xi last month to reopen the dialogue.
Trump imposed 10 percent tariffs on $200 billion worth of Chinese goods in September.
At the same time, Trump - stung by the US Democrats' congressional win in mid-term elections - can avoid further pain for agricultural US states whose exports of key crops like soybeans to China have been hit, said Beijing-based political consultant Hua Po.