BEIJING/WASHINGTON (Reuters) - China and the United States have agreed to hold more trade talks in Beijing, Vice Premier Liu He said as U.S. President Donald Trump ordered his trade chief to begin the process of imposing tariffs on all remaining imports from China.

Liu voiced a measured optimism on reaching a deal, but said there were “issues of principle” on which China would not back down.

“Negotiations have not broken down,” Liu, China’s chief negotiator in the talks, said in Washington on Friday, according to state television on Saturday. “Quite the opposite, I think small setbacks are normal and inevitable during the negotiations of both countries. Looking forward, we are still cautiously optimistic,” Liu said.

Liu’s optimism was tempered by U.S. Treasury Secretary Steven Mnuchin, who told CNBC on Friday that there were no further talks with China planned “as of now.”

Trump wrote on Twitter on Saturday that he thinks China felt they were being “beaten so badly” in the recent negotiations that they may as well wait for the 2020 presidential election “to see if they could get lucky & have a Democrat win - in which case they would continue to rip-off the USA for $500 Billion a year.”

“The only problem is that they know I am going to win,” Trump wrote on Twitter, “... and the deal will become far worse for them if it has to be negotiated in my second term. Would be wise for them to act now, but love collecting BIG TARIFFS!”

The United States escalated a tariff war with China on Friday by hiking levies on $200 billion worth of Chinese goods in the midst of last-ditch talks to rescue a trade deal. Trump had delayed the tariffs as negotiations between Washington and Beijing were progressing.

On Friday, Trump issued orders for the tariff increase, saying China “broke the deal” by reneging on earlier commitments made during months of negotiations.

China strongly opposes the latest U.S. tariff hike, and as a nation, has to respond to that, Liu told a small group of Chinese reporters in the video clip.

Chinese Vice Premier Liu He talks with U.S. Treasury Secretary Steven Mnuchin and Trade Representative Robert Lighthizer as he leaves trade talks in Washington, U.S., May 10, 2019. REUTERS/Leah Millis

“Right now, both sides have reached mutual understanding in many things, but frankly speaking, there are also differences. We think these differences are significant issues of principle,” Liu said. “We absolutely cannot make concessions on such issues of principle.”

He added that talks would continue in Beijing, but gave no details. Underscoring a lack of progress in the talks, Trump ordered a further escalation of tariffs.

Trump’s move would subject about $300 billion worth of Chinese imports to punitive tariffs, U.S. Trade Representative Robert Lighthizer said in a statement on Friday. Lighthizer said a final decision has not been made on the new duties, which would come on top of an early Friday tariff rate increase, to 25% from 10%, on $200 billion worth of Chinese imports.

China’s widely-read Global Times newspaper, which while published by the ruling Communist Party’s official People’s Daily newspaper does not speak for the government, said in a Sunday editorial that the United States has “seriously underestimated China’s endurance”.

“Washington tried to bring up terms that either harmed the sovereignty and dignity of China, or that were seriously unequal and unrealistic. Those requests have made the negotiations more difficult,” the paper said.

CHINA DETAILS DIFFERENCES

Three differences remain between the two countries, according to China’s account of the latest talks.

One of those is over tariffs, Liu said, according to a transcript of the Q&A published by Phoenix, a Hong Kong-based television station that is close to Beijing. China believes that tariffs were the genesis of the trade dispute, and that if both sides wanted to reach an agreement, then all tariffs must be eliminated, Liu said.

The second is about procurement, on which an initial consensus was reached between the leaders of the two countries in Argentina late last year. The two sides now have differing views on the volumes, Liu said. The third is over how balanced the text of the draft agreement should be, he said.

“Every nation has its dignity, so the text ought to be balanced,” Liu said.

Sources told Reuters this week that China had deleted its commitments in the draft agreement that said it would change laws to resolve core complaints of the United States: theft of U.S. intellectual property and trade secrets; forced technology transfers; competition policy; access to financial services; and currency manipulation.

Liu denied the accusations of China’s reneging on promises, saying China thought it was normal to make changes before a final deal. Both sides had differing views on how to phrase it, he said.

Liu said he hoped this issue would be resolved, so it was unnecessary to “over react” to that point. Similar to Liu, Chinese state media said China would not give in on its core interests.

“China clearly requires that the trade procurement figures should be realistic; the text must be balanced and expressed in terms that are acceptable to the Chinese people and do not undermine the sovereignty and dignity of the country,” the People’s Daily newspaper said in a commentary on Saturday.

The trade war has weighed on the Chinese economy.

When asked about domestic concerns over how the latest tariffs could further pressure the economy, Liu said he was optimistic about China’s economy in the longer term, adding that it had entered an up-cycle after bottoming out somewhat last year.

He said he believed the Chinese economy would maintain a stable and healthy trend despite some downward pressure, and that China had ample room for fiscal and monetary policy maneuvers.

On Monday, hours after Trump said he intended to raise tariffs, the Chinese central bank cut the amount of reserves that some small and medium-sized banks need to hold, freeing up more funds for lending to cash-strapped firms.