But with typical reality-show panache, Trump is keeping the content of his deliberations -- whether to stay or leave -- close to his chest.
"He's interested to hear what the G-7 leaders have to say about climate," Gary Cohn, director of the National Economic Council, told pool reporters on the president's overseas trip. He added: "He's heard arguments that are persuasive on both sides. They're both good arguments."
But contestants (i.e. other countries) have not been standing on the sidelines in this key debate, calculating that a decision may be imminent and that Trump often appears to be swayed by the last person with whom he spoke.
Here are four numbers that could make a difference in whether the president decides to stay in the Paris climate accord:
SIX: That's the number of other major economic powers -- Canada, France, Germany, Italy, Japan and the United Kingdom -- in attendance at the G-7 summit.
What are they saying to Trump? "I am very concerned that a U.S. withdrawal from the Paris Agreement would cause lasting damage to the long-standing mutual trust and close cooperation between our two countries and between the U.S. and other countries in Europe and elsewhere," Germany’s environment minister, Barbara Hendricks, wrote in a May 5 letter to the administration.
Why it matters: The implicit threat from Europe is that withdrawing from Paris to fulfill one of Trump's domestic goals -- bolstering fossil-fuel production -- will get in the way of the U.S. government's other goals abroad, where nearly 200 other nations have signed on to the accord. Everything from cooperating to fight terrorism to renegotiating trade deals could become harder.
THIRTY-THREE: That's the number of Fortune 100 companies that support the Paris agreement, according to a head count by the investor advocacy group Ceres.
What are they saying to Trump? "By expanding markets for innovative clean technologies, the agreement generates jobs and economic growth. U.S. companies are well positioned to lead in these markets. Withdrawing from the agreement will limit our access to them and could expose us to retaliatory measures," a group of some of those firms, including Apple, Google and Morgan Stanley, wrote in a full-page newspaper ad earlier this month. The firms also note that reducing the effects of climate change mitigates business risk.
Why it matters: Many of the 33 Fortune firms supporting Paris are manufacturers (like General Motors) or energy companies (like Chevron) that need regulatory certainty in order to make business decisions and, ultimately, create jobs. These companies know there will be another Democratic president someday who most likely will push for a Paris-like international accord, just as President Obama did when he picked up the pieces of the Kyoto Protocol. They would rather stick to an agreement that sets only voluntary emissions targets.
TWENTY-TWO: That's the number of GOP senators who signed a letter asking Trump this week to withdraw from the agreement.
What are they saying to Trump? The risk of litigation from environmental groups, should the United States stay in Paris but continue rolling back Obama-era greenhouse gas regulation is high on their list of concerns.
“Because of existing provisions within the Clean Air Act and others embedded in the Paris Agreement, remaining in it would subject the United States to significant litigation risk that could upend your Administration’s ability to fulfill its goal of rescinding the Clean Power Plan. Accordingly, we strongly encourage you to make a clean break from the Paris Agreement," wrote the GOP senators.
Why it matters: To have a chance of passing health care and tax rewrites, Trump will need the cooperation of every member of the narrow GOP majority in the Senate. The opinion of Republicans -- and those of Environmental Protection Agency Secretary Scott Pruitt and Energy Secretary Rick Perry, among others -- will outweigh that of the 40 Senate Democrats, who, in their own letter to the president this week, urged him to stay in Paris. Trump has to keep the rest of the GOP happy to enact his agenda.
EIGHTEEN: That's the percentage of Republican voters who said they were worried "a great deal" about global warming, according to a Gallup survey in March. Two-thirds of Democrats said they were also greatly worried in that poll.
What are they saying to Trump? Gallup wrote: "Republicans are more in agreement than Democrats about how the subject of global warming is treated in the news: 66% say it is generally exaggerated... Eighty-five percent of Republicans do not think global warming will pose a serious threat to them or their way of life in their lifetime."
Why it matters: This may be the most important number. Even though concern over global warming is at a three-decade high in the United States, the partisan divide on the issue is vast. Trump needs the continued support of his base, especially with the mounting cloud of controversy surrounding the Russia investigation swallowing up Washington. His core voters don't care about Paris except for perhaps wanting to withdraw from it.
Here's some fun pictures from on the ground in Taormina, Italy:
From Howard Mortman of C-Span:
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