White House talking points obtained by The Associated Press said the Paris accord was "a BAD deal for Americans" and that the president's action would keep "his campaign promise to put American workers first". Ivanka Trump and Secretary of State Rex Tillerson have urged the President to remain in the deal, and White House strategist Stephen Bannon and Environmental Protection Agency Administrator Scott Pruitt have been pushing for a withdrawal.
But what will it mean if the US ends up pulling out?
That could help give Trump political cover for the move - as they represent Appalachian, midwest and west voters that backed Trump - even when large portions of corporate America have endorsed the Paris deal.
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President Donald Trump still refuses to back the 2015 Paris agreement to fight climate change, blocking efforts by world leaders meeting in Sicily to get the new United States leader to endorse the treaty, Italy's prime minister said today (26 May).
Abandoning the Paris pact would isolate the US from a raft of worldwide allies who spent years negotiating the 2015 agreement to fight global warming and pollution by reducing carbon emissions in almost 200 nations.
And Sweden's Climate Minister Isabella Lovin says "it would be deeply regrettable" if the United States decides to pull out of a landmark global climate agreement, adding "it is also contrary to what we expect from the USA leadership when humanity faces major challenges".
Administrator Scott Pruitt is part of a small team working on whether to go for a full and formal exit, which will take three years, or if the USA should back out of the United Nations climate change treaty, which would be faster, according to Axios.
If Donald Trump is serious about his pledge to prioritise economic growth and security, the USA national interest will be best served by sticking to the Paris Climate Agreement.
"Details on just how exactly the U.S. will be withdrawing are still being worked out by a team that includes EPA administrator Scott Pruitt", CBS News reported.
Which puts the US right alongside Syria and Nicaragua - the only two countries that declined to be a part of the agreement. Doing so would be to pull out from the most decisive action the modern world has taken to roll back our ongoing climate disaster. "Withdrawing from the agreement will limit our access to them and could expose us to retaliatory measures".
Highlighting the seriousness of the impact of climate change, Guterres said the effects of climate change were unsafe and they were accelerating.
Trump has constantly claimed that there is no real evidence to prove that climate change exists, and has called it a "hoax".
Trump announced over the weekend that he would reveal his decision on the Paris agreement this week.
"We need political leadership", he said.
Trump is expected to make an announcement on it this week.
Trump says the deal "disadvantages" the US and is causing lost jobs and lower wages.
"Many times I've made the argument that climate action actually creates jobs and creates growth, which is what the United States want, what Canada wants - it's what every country wants".
The United States is the world's second-biggest carbon dioxide emitter behind China.
Guterres also pledged to work with developing countries to mobilize resources to tackle the impact of climate change and strengthen efforts by small island states against "the existential threat" that global warming poses.
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