The declaration from Trump comes after he said over the weekend that he had spoken to the leaders of Cambodia and Thailand, urging a ceasefire, adding the U.S. would not get back to the "trading table" with the southeast Asian countries until fighting stops.

President Trump threatened to withhold potential trade deals from Thailand and Cambodia amid a border conflict that has displaced tens of thousands of civilians and left at least 32 people dead. Trump said on Saturday that he spoke with Cambodia’s prime minister Hun Manet and that he called Thailand’s acting Prime Minister Phumtham Wechayachai