China has said it is "irresponsible" of President Trump to suggest it was not putting enough pressure on North Korea over its nuclear programme.
Trump had tweeted that China was "not helping" because of trade tensions with the US.
A Chinese foreign ministry spokesman said this was "contrary to basic facts" and China was "seriously concerned".
Trump called off US Secretary of State Mike Pompeo's planned trip to North Korea.
He said that insufficient progress was being made in dismantling Pyongyang's nuclear programme.
[Source: BBC]
