China stepped up its attacks on the Trump administration Monday over billions of dollars worth of threatened tariffs, saying Washington is to blame for trade friction and repeating it is impossible to negotiate under "current circumstances."

The comments come after U.S. President Donald Trump on Sunday predicted China would take down its trade barriers, and expressed optimism that both sides could resolve the issue through talks.

Chinese state researchers and media talked down the likely impact of U.S. trade measures on the world's second-largest economy and described the Trump administration's posturing on trade as the product of an "anxiety disorder."