PANAMA CITY, Panama — The status of the Panama Canal is non-negotiable, President Jose Raul Mulino said in a statement Monday signed alongside former leaders of the country, after Donald Trump's recent threats to reclaim the man-made waterway.

The US president-elect on Saturday had slammed what he called unfair fees for US ships passing through the Panama Canal and threatened to demand control of the waterway be returned to Washington.

Mulino dismissed Trump's comments Sunday, saying "every square meter of the Panama Canal and its adjacent areas belongs to Panama and will continue belonging to Panama".

He reiterated Monday in a statement -- also signed by former presidents Ernesto Perez Balladares, Martin Torrijos and Mireya Moscoso -- that "the sovereignty of our country and our canal are not negotiable."

“As we look ahead, we must recognize that the challenges you face are growing more complex. Climate change, rising sea levels, and geopolitical tensions mean that the stakes have never been higher. Patrolling a coastline that spans over 37 million kilometers and watching over our Exclusive Economic Zone is no small feat,” Marcos said. 

The committee hearing is scheduled for Wednesday, October 23, at 10 a.m.

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The canal "is part of our history of struggle and an irreversible conquest," read the statement, which the four politicians had signed after a meeting at the seat of the Panamanian government.

"Panamanians may think differently in many aspects, but when it comes to our canal and our sovereignty, we all unite under the same flag."

Former leader Laurentino Cortizo, who did not attend the meeting, also showed support for the statement on social media, as did ex-president Ricardo Martinelli.

The 80-kilometer (50-mile) Panama Canal carries five percent of the world's maritime trade. Its main users are the United States, China, Japan, South Korea and Chile.

It was completed by the United States in 1914, and then returned to the Central American country under a 1977 deal signed by Democratic president Jimmy Carter.

Panama took full control in 1999.fbjili