Hundreds of protesters gathered Tuesday in front of the Trump Hotel in Washington, D.C., with alarm clocks to "wake up" President Donald Trump to the climate crisis, as the Trump administration is expected to decide soon whether to pull the US out of the Paris climate agreement.
Trump's predecessor Barack Obama, who alongside Xi was instrumental in the agreement's birth in 2015, also entered the fray on Tuesday.
The official said the delay came amid scheduling conflicts.
That session, along with other West Wing meetings to discuss the issue, have become heated as Trump's advisers air their differences over the Paris agreement.
A meeting of top White House aides to discuss the agreement had been scheduled for Tuesday.
The White House originally said that Trump hoped to decide by the meeting - held in Sicily in late May - whether to pull the United States from the landmark climate pact.
According to those close to the discussions, the look into the legalities of the deal has led to widespread agreement among different agencies that remaining in the accord, while failing to reach the carbon reduction targets set by the Obama administration, would open the administration to legal challenges by climate activists.
Chinese President Xi Jinping has said he will uphold the Paris agreement on curbing climate change, in a telephone conversation with French President-elect Emmanuel Macron.More news: Trump assures Abbas Israeli-Palestinian peace
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"It is definitely the elephant in the room", a member of one national delegation told AFP on Tuesday.
The core of the Paris deal was an agreement between Xi and then U.S. president Barack Obama.
UN climate negotiators in Bonn were left frustrated Tuesday as the White House postponed a meeting to determine whether the United States will stay in the 196-nation Paris Agreement to curb planet-harming fossil fuel.
The former president said climate change "is already making it more hard to produce food".
"We must stay in Paris, we must pass on a healthy economy and a healthy environment to our children", Lubber said.
The perspective comes as the Trump administration is engaged in a fierce internal debate about how to proceed with the Paris climate deal and whether to explore leaving the accord altogether.
Like Trump, Pruitt has questioned the consensus of climate scientists that man-made carbon emissions are the primary driver of global warming.
Trump has recently delayed a decision to withdraw from the Paris Agreement, which asks participating countries to do things like cut greenhouse gas emissions so the global average temperature doesn't rise too much.