Former Vice President Al GoreAlbert (Al) Arnold GoreOvernight Energy: Biden seeks to reassert US climate leadership | President to 'repeal or replace' Trump decision removing protections for Tongass | Administration proposes its first offshore wind lease sale The Hill's Morning Report - Presented by Facebook - Bipartisan group reaches infrastructure deal; many questions remain Al Gore lobbied Biden to not scale back climate plans in infrastructure deal MORE says he's given up hope that President TrumpDonald TrumpNorth Carolina Senate passes trio of election measures 14 Republicans vote against making Juneteenth a federal holiday Border state governors rebel against Biden's immigration chaos MORE will "come to his senses" and act on climate issues.

Gore on Monday night told "Late Show" host Stephen Colbert that his hopes about Trump were wrong.

"I went to Trump Tower after the election," said Gore, who was on the show to promote his new documentary, "An Inconvenient Sequel: Truth to Power."

"I thought that there was a chance he would come to his senses. But I was wrong." 

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Gore said he initially worried that Trump withdrawing the U.S. from the Paris climate agreement last month was "disastrous." But he felt some optimism after seeing how other countries "doubled down" and pledged to do even more to fulfill the agreement's goals, as well as other U.S. leaders' promises to work toward the deal. 

"A lot of our most important governors and mayors and business leaders said, 'We're still in the Paris agreement, and we’re going to meet the commitments of the country regardless of what Donald Trump tweets.' "

Every country except the U.S. at the G-20 summit in Hamburg, Germany, earlier this month agreed to the terms of the 2015 Paris climate agreement, which was negotiated during the Obama administration. 

French President Emmanuel Macron has said he is going to continue to try to convince Trump to change his mind about his decision to withdraw the U.S. from the agreement.