President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE on Thursday threatened to pull the U.S. out of the World Trade Organization (WTO) "if they don't shape up," a stance he has reportedly discussed in private but has denied publicly.

“If they don’t shape up, I would withdraw from the WTO,” the president told Bloomberg News in an interview.

Trump has long criticized the international body, saying in late June that the U.S. has been "treated very badly" by the group, describing it as an "unfair situation."

At the time, the president insisted he was not considering pulling out of the WTO despite his frustrations, though Axios reported he had discussed with advisers his intentions to exit.

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Leaving the WTO would upend the decades-old international trade system, which the U.S. helped establish, and roil markets around the globe.

The U.S. on Monday told the WTO that it plans to block the reappointment of one of the its four remaining judges, a move that would significantly hinder the organization's ability to function.

If the U.S. successfully blocks the appointment of Judge Shree Baboo Chekitan Servansing, the WTO would only have three judges, the bare minimum to continue operations.

Two of the WTO judges’ terms expire in December of next year.

Trump and European Commission President Jean-Claude Juncker recently agreed to work towards a trade agreement that would involve reforming the WTO.

Multiple nations have filed complaints about Trump's escalating tariffs with the WTO, including China. Trump is reportedly planning to impose $200 billion tariffs on Chinese imports as soon as next week, on top of the billions of dollars of tariffs he has already implemented.