"When Donald Trump says to the world, well, we're going to negotiate a better deal... That's like O.J. Simpson saying he's going to find the real killer," Kerry said in an interview on NBC's "Meet the Press," alluding to the former American football star who was controversially acquitted of killing his former wife.
Trump, he said, is not going to renegotiate the treaty despite suggesting he might do so "because he doesn't believe in it. If you did believe it, you wouldn't pull out of Paris."
"America has unilaterally ceded global leadership on this issue, which for years even Republican presidents ... Pushed in this direction."
By the same token, Kerry defended former president Barack Obama's use of his executive power to enter into the agreement, rather than seek its ratification by the US Senate.
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"It makes no sense to me -- a reckless decision, an indefensible decision. I think it undermines our nation's standing in the world and it threatens humanity's ability to solve this crisis in time," he said on the "Fox News Sunday" program.
The US ambassador to the United Nations, Nikki Haley, meanwhile offered assurances in television interviews on CNN and NBC that Trump, who once called climate change a "hoax" perpetrated by the Chinese, does indeed believe in climate change.
"What's important here is, what the president did on Thursday is put America first," he said.
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