Trump: If China wants to solve ‘North Korean problem,’ they will

President Trump on Friday put new pressure on China to rein in North Korea, saying “if they want to solve the North Korea problem, they will.”

“China is very much the economic lifeline to North Korea so, while nothing is easy, if they want to solve the North Korean problem, they will,” Trump tweeted.

China is very much the economic lifeline to North Korea so, while nothing is easy, if they want to solve the North Korean problem, they will

— Donald J. Trump (@realDonaldTrump) April 21, 2017

{mosads}On the campaign trail, Trump vowed to pressure China to crack down on North Korea for its nuclear and missile programs. But Trump appeared to change his tone on the matter last week after meeting with Chinese President Xi Jinping.

During the meeting, Trump told The Wall Street Journal, he “realized it’s not so easy” after Xi explained the relationship between China and North Korea. China is North Korea’s sole major ally.

Trump’s comments on Friday come amid heightened tensions between the U.S. and North Korea, with both sides floating the possibility of military action against one another.