U.S. President Donald Trump has told Chinese President Xi Jinping that the United States will impose sanctions on Chinese companies with links to North Korea's nuclear and missile development if Beijing fails to crack down on such entities, Trump's top diplomat said Wednesday.

The United States has provided China with a list of entities Washington believes Beijing needs to take action against, Secretary of State Rex Tillerson told a hearing at the House Foreign Affairs Committee.

"We have asked that they take the action, but President Trump has also been very clear with President Xi that if they either don't want to take the action or they do not take the action, we will act on our own," he said.