Former Vice President Al Gore said that President Trump's decision to pull out of the Paris climate agreement was "reckless" and "undermines America's standing in the world" during an interview on CNN on Sunday.
Trump pulled out of the Paris climate agreement last week, citing economic concerns and unfair business advantages as the main motivating factors behind his decision.
More than 190 nations had signed onto the accord.
"I think it was reckless; I think it was indefensible and undermines America's standing in the world and threatens the ability of humanity to solve the climate crisis in time," Gore told CNN host Jake Tapper on "State of the Union."
"The decision was a terribly mistaken decision, but in the aftermath of that decision, we need to move forward regardless of what he decides" Gore said.
Gore, who has become a climate advocate since losing the presidential race in 2000, said that even if the president refused to take the lead on climate change, that governors, mayors, business leaders, and private citizens would have to take up the mantle.
"And the good news is, that the American people are going to provide leadership even if President Trump will not provide leadership," said Gore.