Trump has not given any indication of which way he is leaning, saying he'd been "hearing from a lot of people, both ways".
"I obviously don't know whether he's made it (a decision)", Spicer said.
Exiting the deal would be certain to anger allies that spent years negotiating the accord to reduce carbon emissions.
China says it will work with the European Union to uphold the worldwide agreement on climate change even if the US pulls out. He's also a former senior adviser and India counselor to the U.S. Special Envoy on Climate Change at the State Department.
US President Donald Trump considers climate change a "hoax". While U.S. Secretary of State Rex Tillerson supports remaining in the deal, Trump's chief strategist Stephen K. Bannon is in favor of leaving the agreement.
The Paris Agreement is a deal reached between 195 countries to gradually reduce emissions that cause climate change in order to prevent a major increase in the global temperatures that could raise sea levels, spark major droughts, and lead to more unsafe storms. If participating nations and industry leaders assume the United States exit is only a temporary bump and that future presidents will return to the table and pursue similar policies as Obama, that could also make them reluctant to make decisions based on Trump's decision alone. Like the other officials, that person was not authorized to describe the private discussions by name and spoke only on condition of anonymity.
EU, China to reaffirm support for climate pact
President Donald Trump will announce that the United States is withdrawing from the Paris climate change accord. Russian Federation joined the chorus, saying that the deal will be less effective without its key participants.
"The EU and China consider climate action and the clean energy transition an imperative more important than ever", the statement, by European Council President Donald Tusk, European Commission President Jean-Claude Juncker and China's Li, will say.
The powers also "underline that tackling climate change and reforming our energy systems are significant drivers of job creation, investment opportunities and economic growth", according to the draft statement, which also emphasizes the importance of global collaboration in combating climate change. "Climate solutions provide opportunities that are unmatchable".
The Sierra Club's executive director, Michael Brune, called the expected move a "historic mistake which our grandchildren will look back on with stunned dismay at how a world leader could be so divorced from reality and morality".
U.S. Defense Secretary Jim Mattis responded in a television interview Sunday, assuring that Trump was "wide open on this issue as he takes in the pros and cons of that accord".
But President Trump's chief White House economic adviser, Gary Cohn, told reporters during the trip overseas that President Trump's views on climate change were "evolving" following the president's discussions with European leaders.
He has previously had to defend his position advising the President, telling critics they should want his voice on those councils offering views different to those of Trump's other advisers.
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The agreement, which was negotiated in 2015 and took effect in November 2016, was spurred by the overwhelming global scientific consensus that rising global temperatures over the last several decades are caused by man-made activity.
Any delay in USA efforts to halt greenhouse gas emissions could cost the country and the world in the long term, scientists say.
Trump had vowed during his 2016 presidential campaign to "cancel" the Paris deal within 100 days of becoming president as part of an effort to bolster USA oil and coal industries.
President Donald Trump has declared that abandoning the Paris climate agreement would be a victory for the American economy.
Polluting industries such as oil and coal are highly automated and are unlikely to embark on a major hiring spree even if the United States dropped out of the Paris agreement, experts say.
Democratic U.S. Senators Bob Menendez and Jack Reed wrote a letter urging Trump not to withdraw. These include carbon dioxide generated from burning of fossil fuels that scientists blame for a warming planet, sea level rise, droughts and more frequent violent storms.
Under the agreement, the USA had agreed to reduce the country's pollution emissions to 26 percent to 28 percent of 2005 levels by 2025 - about 1.6 billion tons.
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The United States is the world's second biggest carbon emitter, after China.