The landmark agreement was signed in Paris in late 2015 and some 147 countries have now ratified the deal which seeks to reduce global warning by committing to keeping global temperatures below 2 degrees Celsius and reviewing each country's commitments every five years.
Scientists say that Earth is likely to reach more risky levels of warming sooner if the USA retreats from its pledge because America contributes so much to rising temperatures. It was the first legally binding global climate deal. The US had previously committed to a goal of reducing carbon emissions by 26% to 28% by 2025.
In the past few days, the chief executives of dozens of companies have made last-minute appeals to Trump.
Mr Trump has said the accord would cost the USA economy trillions of dollars without tangible benefit. For the Republican president, a withdrawal would reflect his "America First" approach to policy, unencumbered by worldwide obligations.
Juncker went on to say that the Group of Seven leaders "tried to explain this in clear simple sentences to Mr. Trump" at a recent summit in Italy.
But according to Politico, "The upcoming decision is a victory for hardliners such as senior White House adviser Stephen Bannon, who argued that the deal would hobble the US economy and Trump's energy agenda".
Former US president Barack Obama and the Chinese leadership were instrumental in building momentum toward the climate deal.
Earlier this month, the governors of MA and Vermont called on the Trump administration to maintain the nation's commitment to the climate accord, writing that "the impacts of climate change have already been felt in our states".
The Paris accord, which was agreed on in December of 2015 by almost 200 countries, aims to keep global temperatures from rising more than 2° C (3.6° F) above pre-industrial levels.
Trump to announce decision on Paris climate agreement soon
US carbon emissions have declined to near 30-year lows, a trend driven by increased natural gas use replacing coal. These included lifting a 14-month-old moratorium allowing federal lands to be used for coal mining and reviewing oil, gas and fracking regulations.
"We will issue a joint statement on climate change that will stress that China and the European Union. will implement the agreement", the senior European Union official told reporters on Wednesday, on condition of anonymity.
At a conference near Los Angeles, Democrat Hillary Clinton, whom Mr Trump defeated for the presidency past year, said withdrawing would be a mistake.
Failure to exit the agreement could also undermine his "America First" strategy, the newspaper noted.
Trump claimed before taking office that climate change was a hoax created by the Chinese to hurt the US economy, an assertion that stands in defiance of broad scientific consensus.
Reports emerged on Wednesday that Trump would pull out of the agreement, something he promised to do during his presidential campaign. That promise helped rally supporters sharing his skepticism of global efforts to police USA carbon emissions.
Senate Majority Leader Mitch McConnell, R-Ky., and 21 other Republican sent Trump a letter last week urging him to follow through on his campaign pledge to pull out of the climate accord.
Mr Trump faced considerable pressure to hold to the deal during meetings with European leaders and Pope Francis on his recent trip overseas.
Aides to Trump said he was listening with an open mind to the other leaders' arguments about Paris, but didn't feel obligated to heed their calls to remain within the pact.More news: Trump back in Washington area after 9-day trip