Prime Minister Shinzo Abe is considering sending a letter asking the administration of U.S. President Donald Trump not to depart from the 2015 Paris Climate Agreement, a government source said Monday.

If he decides to send the letter, it is expected to emphasize the importance of cooperation between all nations to tackle global warming, without explicitly telling Washington it should remain committed to the climate framework, according to the source.

The plan comes amid Tokyo's concerns that Trump may announce a U.S. departure from the accord at a May 26-27 summit of the Group of Seven industrialized nations in Italy, the source said.

In a related move, French President-elect Emmanuel Macron told Trump over the phone Monday that he would defend the carbon-capping pact, according to his spokeswoman, Laurence Haim.

Climate change "is a very important and sensitive issue for the French. He told him (Trump) that he will protect what was made in Paris," Haim told CNN after Trump congratulated Macron on his victory in Sunday's presidential election during their telephone conversation.

Trump in late March signed an executive order to roll back predecessor Barack Obama's measures to curb carbon emissions. Obama ratified the accord last September.

The Paris agreement was struck by some 200 countries to combat global warming.

Trump told Reuters late last month he would announce a decision in about two weeks on whether Washington would remain in the accord, complaining the United States was being unfairly treated in it.