Former Vice President Al Gore doesn't believe the United States will reenter the United States into the Paris climate agreement under President Donald Trump.

"I don't think he's going to change on that," Gore said Tuesday at an event hosted by Axios.

Gore admitted that he cut off communication with Trump after the latter announced last year he was pulling the U.S. out of the agreement that placed restrictions on pollution levels. Trump said it would result in a big hit to America's GDP and millions of job losses because of regulations it would have imposed.

Gore, however, expressed optimism that the U.S. could eventually be back in the agreement when Trump finishes his time in office.

"I know what you're thinking, President Trump made his statement, but the first day on which the U.S. could legally withdraw from the Paris agreement happens to be the day after the next president election," Gore said.

"If there is a new president, a new president could simply give 30 days notice and the U.S. is right back in the agreement."

Trump is expected to discuss the Paris agreement with French President Emmanuel Macron at the White House Tuesday.

Gore has been involved in the environmentalist movement since the 1970s and has dedicated his work to it since 2001 when he finished his two terms as vice president. Along with the Intergovernmental Panel on Climate Change, he was a co-recipient of the 2007 Nobel Peace Prize.