"They have not been buying the agricultural products from our great Farmers that they said they would". "Hopefully, they will start soon".
Trump and his Chinese President Xi Jinping agreed in June to resume negotiations.
China's trade surplus with the United States widened by 3 percent to $29.9 billion.
In the readout of the Xi-Trump meeting published by the state-run Xinhua news agency, it only mentioned that Mr Trump said he hoped China could increase imports from the USA, and didn't say how Mr Xi or the Chinese team responded.
Prior to the trade war ceasefire, Trump had threatened to impose tariffs on an additional $325 billion of goods manufactured in China.
But data released on Thursday (July 11) by the US Department of Agriculture indicate that China actually slowed its purchases of American agriculture products following the G-20 meeting. A Chinese statement said only that: "The U.S. side hopes China can import more from them". In an interview with the Fox Business Network, Kudlow described the discussions as "preliminary" and said meetings will "probably" be arranged, but did not give more details.
There has been a precedent of China backtracking on its trade promises during negotiations.
June marked the first full month of higher US tariffs on $200 billion of Chinese goods, which Washington announced weeks earlier after trade talks between the world's largest economies broke down.
On May 10, $200 billion worth of Chinese goods began to be subjected to a new tariff rate of 25 percent-a hike from 10 percent-after Trump announced the unexpected move five days earlier on Twitter.
Mr Hu Xijin, editor-in-chief of the state-owned Global Times newspaper tweeted late Thursday that the "achievement of Osaka summit is a China-US consensus, not a unilateral commitment China made to the US".
Since both nations first slapped tariffs on each others' goods back in March 2018, the cumulative loss in the value of goods exported between both nations now totals $42.9 billion.
The two countries are fighting over US allegations that China deploys predatory tactics - including stealing trade secrets and forcing foreign firms to hand over technology - in a headlong drive to challenge American technological dominance.