"Tariffs are a great negotiating tool," Trump tweeted, one day after saying he was ready to impose another round of punitive tariffs on China.
On Monday, the Republican president said he would raise tariffs on Chinese imports further if he cannot make progress in trade talks with Chinese President Xi Jinping at the G20 summit later this month, Reuters reported.
Trump has repeatedly said he is getting ready to meet Xi at the summit in Osaka, Japan, at the end of June, but China has not confirmed it.
Chinese Foreign Ministry spokesman Geng Shuang again would not be drawn into confirming a Xi-Trump meeting at G20, saying information would be released once it was available to the Foreign Ministry.
"China does not want to fight a trade war, but we are not afraid of fighting a trade war," he said, adding China's door was open to talks based on equality.
"If the United States only wants to escalate trade frictions, we will resolutely respond and fight to the end."
Last week, Trump said he would decide after G20, the meeting of the leaders of the world's largest economies, whether to carry out a threat to impose tariffs on an additional $300 billion in Chinese goods.
Tensions between Washington and Beijing flared in May after the Trump administration accused China of reneging on promises to make structural economic changes during months of trade talks.
The United States is seeking sweeping changes, including an end to forced technology transfers and theft of US trade secrets. It also wants curbs on subsidies for Chinese state-owned enterprises and better access for US firms to Chinese markets.
On May 10, Trump raised tariffs on $200 billion of Chinese goods to 25% and took steps to levy duties on an additional $300 billion in Chinese imports. Beijing retaliated with tariff hikes on a revised list of $60 billion in US goods.
US Commerce Secretary Wilbur Ross on Tuesday downplayed the likelihood of resolving the dispute at the G20 summit, saying it would not be "a place where anyone makes a definitive deal."
"At the G20, at most it will be ... some sort of agreement on a path forward, but certainly it's not going to be a definite agreement," Ross told CNBC.