China will respond firmly if the United States insists on escalating trade tensions, the foreign ministry said on Tuesday after U.S. President Donald Trump said further tariffs were ready to kick in if no deal was reached at June’s G20 summit.

Trump has repeatedly said he is getting ready to meet Chinese President Xi Jinping at the Osaka summit at the end of June, but China has not confirmed it, Reuters reports.

Trump said last week he would decide after the meeting of the leaders of the world’s largest economies whether to carry out a threat to impose tariffs on at least $300 billion in Chinese goods.

On Monday, Trump said he was ready to impose another round of punitive tariffs on Chinese imports if he cannot make progress in trade talks with Xi in Osaka.

Chinese Foreign Ministry spokesman Geng Shuang again would not be drawn on confirming a Xi-Trump meeting at G20, saying information would be released once it was available to the ministry.