President Trump has told his advisers to start preparing to withdraw from the free trade agreement the U.S. has with South Korea, according to a report.

The administration is said to be far along in terminating the deal, with the formal withdrawal process expected to begin soon, the Washington Post reported Saturday.

The Post noted that some senior White House officials are trying to keep Trump from withdrawing the deal, including Defense Secretary James Mattis, National Economic Council Director Gary Cohn and National Security Adviser H.R. McMaster.

The advisers are worried about withdrawing from the agreement at a time when North Korea has become increasingly adversarial and aggressive. The totalitarian country has launched several missile tests in recent months, part of an ongoing string of aggression connected to its nuclear program.

If the U.S. withdraws from the free trade agreement, then Trump may be able to force South Korea to import more U.S. products and not face any import restrictions.

Trump spoke with South Korean President Moon Jae-in on Friday about the North Korean threat and according to a White House readout gave "conceptual approval of planned purchases" of military equipment.