Story highlights Gore said he thought Trump would "come to his senses" on the Paris agreement

He cast Trump's decision as an abdication of leadership

Washington (CNN) Former Vice President Al Gore expressed disappointment Sunday over his failure to persuade President Donald Trump to keep the US in the Paris climate agreement.

Gore said on CNN's "State of the Union" that Trump's decision was a threat to humanity and bad for the US position in global politics. "I think it was reckless," Gore said. "I think it was indefensible. It undermines America's standing in the world. It threatens the ability of humanity to solve the climate crisis in time."

Trump announced on Thursday his decision to initiate the nation's withdrawal from the landmark agreement of which nearly every country on earth is a member. His speech came after weeks of internal White House debate.

Trump's daughter and adviser, Ivanka, was among those who supported the US remaining in the agreement.

Gore met with both Trumps in December at Trump Tower in New York. At the time , he called their discussion "lengthy and very productive."

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