He said China wanted to make a deal but he wasn't sure that he did.
This year the United States imposed $250 billion in tariffs on Chinese imports and Mr Trump has threatened there may be more on the way in the New Year.
French President Emmanuel Macron stepped up pressure on Salman over Khashoggi's killing by telling him worldwide experts need to be involved in the murder investigation.
Theresa May was among world leaders lining up to shake hands with Mohammed bin Salman last night less than two months after the murder of a journalist by a Saudi Arabian hit team. As CBS News and other outlets have reported, the Central Intelligence Agency has concluded that the crown prince ordered the assassination.
Saudi-owned broadcaster Al Arabiya posted video on Twitter showing a cordial handshake between bin Salman and Chinese President Xi Jinping as the two held a bilateral meeting.
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Maybe most satisfying of all, Ohio State has won 14 of the last 15 meetings against the team it loves to beat the most. He entered the MI game in relief a year ago as a redshirt freshman when starting quarterback J.T.
In the video, the Saudi prince can be heard telling the French president "Don't worry", to which he replies, "I am anxious".
Trump, in an exclamation point-heavy statement before the summit, said it did not matter whether Prince Mohammed knew about Khashoggi's death and that Saudi Arabia was important for business and for its hostility to Iran.
At the end Mr Macron can be heard saying: "I am a man of my word".
Meanwhile, French President Emmanuel Macron met with Mohammed bin Salman on the sidelines of the summit and had a short exchange with him.
However some world leaders seemed very glad to see MBS, not least Russian President Vladimir Putin.
Modi stressed the importance of stable energy prices and the two leaders discussed ways in which Saudi Arabia, a top crude oil supplier, could help stabilize prices, particularly for India, Gokhale said.
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There is need of a cut, but Russian Federation doesn't want to chip in with a large cut, a second source told Reuters. Under pressure from angry senators and other Washington power players, he needs Trump's political protection.
Saudi Arabia has said the prince had no prior knowledge of the murder.
There has been widespread condemnation and public outrage over attacks on sites such as school bus and hospitals, where Yemeni civilians, including children, have died.
During the course of the day, President Trump "exchanged pleasantries" with Salman, telling reporters that while they didn't talk about hot-button issues concerning the USA and Saudi Arabia, it was possible the pair would do so as the summit rolled on.
However, Russia has suggested U.S. domestic politics may have been the real reason behind the cancellation.
"They exchanged pleasantries at the leaders' session as he did with almost every leader in attendance", a senior White House official said.
US President Donald Trump "exchanged pleasantries" with Saudi Crown Prince Mohammed bin Salman at the G20 summit, a White House official says.
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However, the woman disputed that fact and said that she was kicked out of Hunt's place because she "didn't want" one of the men. As shown in the video embedded below, Hunt pushes the woman in the lobby and later kicks her while she is on the ground.
Ms Merkel said she would address the Russia/Ukraine stand-off during their discussions, a crisis she has blamed "entirely" on Russia.