President Trump on Sunday questioned why he would label China a "currency manipulator" when it is working with the U.S. to deal with an increasingly aggressive North Korea.

Why would I call China a currency manipulator when they are working with us on the North Korean problem? We will see what happens! — Donald J. Trump (@realDonaldTrump) April 16, 2017

During an interview last week, the president said he would not label China a currency manipulator, breaking from his campaign promise to do so.

"They’re not currency manipulators," Trump told the The Wall Street Journal in an interview, saying Beijing hadn’t been manipulating its currency for months.

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During a meeting earlier this month with Chinese President Xi Jinping, Trump reportedly did not bring up the issue.

Trump last week also said he has "great confidence that China will properly deal with North Korea."

"If they are unable to do so, the U.S., with its allies, will! USA" the president tweeted last week.

North Korea attempted to launch a ballistic missile Sunday on its east coast but failed, U.S. and South Korean military officials said. The attempt came a day after North Korea held a military parade showing off its latest missiles, amid increased tensions in the region over its nuclear program.

Minutes after his China tweet, Trump also wished followers a happy Easter: