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"China is adding great stimulus to its economy while at the same time keeping interest rates low," Trump tweeted on April 30. "Our Federal Reserve has incessantly lifted interest rates, even though inflation is very low, and instituted a very big dose of quantitative tightening."

"By all accounts, this was a very successful test," NASA Administrator Jim Bridenstine said.

"China is getting a foothold in Latin America. It is using economic statecraft to pull the continent into its orbit," he said in a Feb 1 speech.

"China is willing to share knowledge of advanced new energy technologies－including hydropower, photovoltaics and wind power－with other countries," he said.

"But what we should understand is that steel for the automotive manufacturing sector is constantly changing, and the materials used in the car today are not comparable to the steel of a decade ago."