President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE warned Chinese President Xi Jinping in an early morning tweet on Monday that his country would be "hurt very badly" if a deal to end the year-long trade war between Washington and Beijing is not reached.

"I say openly to President Xi & all of my many friends in China that China will be hurt very badly if you don’t make a deal because companies will be forced to leave China for other countries," Trump said.

"Too expensive to buy in China. You had a great deal, almost completed, & you backed out!"

I say openly to President Xi & all of my many friends in China that China will be hurt very badly if you don’t make a deal because companies will be forced to leave China for other countries. Too expensive to buy in China. You had a great deal, almost completed, & you backed out! — Donald J. Trump (@realDonaldTrump) May 13, 2019

The U.S. and China seemed poised to reach a deal last week before reported backsliding from Chinese negotiators led Trump to impose harsh sanctions.

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Trump raised tariffs from 10 percent to 25 percent on $200 billion worth of Chinese imports on Friday after a breakdown of negotiations.

Chinese negotiators reportedly tried to reverse their vows to address issues such as theft of trade secrets and intellectual property.

Trump in another series of tweets on Monday warned China against retaliation and defended the tariffs, saying Beijing will pay for them.

"Their is no reason for the U.S. Consumer to pay the Tariffs, which take effect on China today. This has been proven recently when only 4 points were paid by the U.S., 21 points by China because China subsidizes product to such a large degree," Trump tweeted, although it was not immediately clear what evidence he was citing.

"Also, the Tariffs can be completely avoided if you by from a non-Tariffed Country, or you buy the product inside the USA (the best idea). That’s Zero Tariffs. Many Tariffed companies will be leaving China for Vietnam and other such countries in Asia," he said.

"There will be nobody left in China to do business with. Very bad for China, very good for USA! But China has taken so advantage of the U.S. for so many years, that they are way ahead (Our Presidents did not do the job). Therefore, China should not retaliate-will only get worse!" he added.

The tweets come after top White House economic adviser Larry Kudlow Larry KudlowMORE on Sunday contradicted Trump, saying China isn't paying tariffs on goods going into U.S.

Many Democrats have criticized Trump's reliance on tariffs and said their costs will be borne by farmers, not China.

China has expressed willingness to continue negotiations, although foreign ministry spokesman Geng Shuang said on Monday that China would "never surrender to external pressure," according to Reuters.