Though Syria indicated its intention to sign onto the deal, it has not yet submitted its targets to cut greenhouses gases.
President Donald Trump said in June that the U.S. would withdraw from the accord, saying it put the country at a disadvantage.
On June 1, U.S. President Donald Trump announced from the White House Rose Garden that he would withdraw the country from the Paris climate accord, asserting that it would hobble jobs and economic growth, according to The New York Times.
The U.S.is the second-largest carbon dioxide-emitting nation on the planet after China, according to the European Commission.
Trump's decision was met with praise from Republican lawmakers and criticism from world leaders.
Barack Obama signed the treaty in his second term as USA president. Many delegates said they hoped Trump would reconsider.
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Trump has criticized the deal as a source of the US trade deficit with South Korea, an argument officials there dismiss. It's a big problem for our country and the world, and we want to get it solved, ' he said.
The report comes after Nicaragua last month signed the agreement, which left the USA and Syria as the only two countries not supporting it.
On June 2, former Secretary of State John Kerry of the Obama administration called the US withdraw from the Paris agreement "one of the most cynical and frankly ignorant and unsafe, self-destructive steps that I've seen in my entire lifetime in public life".
The only other previous holdout, Nicaragua, announced in September that it would join the pact.
A French diplomatic official said the countries whose heads of state are being invited are those who are "especially committed" to applying the Paris accord.
Syria is also joining, and announced its move Tuesday at climate talks in Bonn, Germany, Der Spiegel reported. Some 25,000 scientists, envoys, lobbyists and environmental activists have descended on the city for two weeks to figure out how to turn the goals of the Paris accord into reality.
David Waskow, of the World Resources Institute think-tank, noted that Trump's climate views had previously isolated him from other leading economies in the Group of Seven and the Group of 20. "We have witnessed extraordinary weather, including temperatures topping (122 degrees Farenheit) in Asia, record-breaking hurricanes in rapid succession in the Caribbean and Atlantic reaching as far as Ireland, devastating monsoon flooding affecting many millions of people and a relentless drought in East Africa".
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