Trump had hoped to announce a decision by the Group of Seven nations summit May 26-27 in Sicily, Italy, but White House press secretary Sean Spicer said it has now been put off.
Tiffany & Co.'s message to the Donald Trump arrives as the president considers whether or not to withdraw the United States from the Paris Agreement-the first global, legally-binding agreement to reduce greenhouse gas emissions and avoid the dangers of climate change worldwide.
Spicer said Trump is continuing to hear from advisers on the pros and cons of remaining in the global accord.
Administration officials said the crunch sit-down set for Tuesday had "been postponed" and may now take place next week.
Should the USA stay in the Paris climate agreement, or should it go?
On April 18, the White House postponed a similar meeting about the agreement due to "scheduling conflicts".
Like Trump, Pruitt has questioned the consensus of climate scientists that man-made carbon emissions are the primary driver of global warming.
The United States is the world's number two carbon polluter, after China.
While the White House appears to not have yet to decide where they stand on the agreement, envoys convened talks on Monday in Germany discussing the implementation of the deal to combat the effects of global warming.
As uncertainty mounted over the hard-fought pact's future under US President Donald Trump, China's leader Xi Jinping came to its defence.
Delattre said he "underscored this point" in a White House lunch with President Trump, when the president met with members of the U.N. Security Council late last month.
Trump, himself, who promised as a candidate to "cancel" the Paris agreement, has said he still wants out, according to administration officials.
The Bonn meeting is tasked with starting work on rules to guide countries in implementing the Paris pact - how to measure and report on their greenhouse gas emission cuts, for example.
Under the shadow of a possible USA pullout from the 2015 Paris climate accord, envoys are meeting in Germany on implementing the details of the deal.
"It is clear from the agreement that if you do change your target, you are encouraged to change it in a more ambitious direction", she said.
When asked about the USA position, Yvon Slingenberg, head of the European Commission's delegation, told a news conference: "We do consider that it would be quite important (for the U.S.) to stay at the table", even with Trump's pro-coal policies.
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