PENNSYLVANIA — U.S. President Donald Trump said he plans to make a phone call on Wednesday about renewed fighting along the Thailand-Cambodia border, where clashes have intensified after a fragile ceasefire collapsed.

The border violence entered its third day on Wednesday, as both governments reported new casualties and mass evacuations. The latest escalation follows Thailand’s suspension of de-escalation measures last month, a move triggered by a landmine blast that severely wounded a Thai soldier — an incident Bangkok claimed was caused by a newly laid Cambodian device, an allegation Phnom Penh rejected, Reuters reported.

Trump referenced the conflict during a rally in Pennsylvania, saying he intended to intervene by phone.

“It started up today and tomorrow I am going to have to make a phone call,” he said, according to Reuters, adding that he had previously helped halt conflicts “between very powerful countries.”

A senior adviser to Cambodian Prime Minister Hun Manet told Reuters that Cambodia remained “ready to talk at any time,” while Thai Foreign Minister Sihasak Phuangketkeow said he saw “no potential for negotiations” under current conditions and rejected third-party mediation.

Trump played a central role in securing a July ceasefire that ended five days of heavy clashes, which killed at least 48 people, according to Reuters. At the time, he used the leverage of ongoing U.S. trade talks with both nations, though the Thai foreign minister said he opposed using tariff threats to pressure Bangkok into negotiations.

The current round of fighting has displaced hundreds of thousands of residents on both sides of the border. Cambodia’s Defence Ministry said nine civilians had been killed and 20 severely injured since Monday, while Thailand reported four soldiers killed and 68 wounded.

Thailand’s military signaled a long-term strategy, with a top general saying the army’s goal was to “cripple Cambodia’s military capability for a long time to come”. Cambodia accused Thai forces of “indiscriminately and brutally targeting civilian residential areas,” allegations Thailand denied.