Former Vice President Al Gore met with President-elect Donald Trump on Monday, in what Gore described as a “lengthy and very productive session.”

“It was a sincere search for areas of common ground,” Gore told reporters in the lobby of Trump Tower.

Gore, who served two terms under President Bill Clinton, said he met with Trump’s daughter, Ivanka Trump, beforehand, but “the bulk of the time was with the president-elect.”

“I found it an extremely interesting conversation, and to be continued, and I’m just going to leave it at that,” Gore said.

Gore, a Democrat who campaigned on behalf of Hillary Clinton late in the campaign season, arrived at Trump Tower shortly after 11:20 a.m. and returned to the lobby at 1 p.m.

Following his loss in the 2000 presidential election, Gore emerged as a prominent environmental activist, appearing in the 2006 documentary about global warming, “An Inconvenient Truth.” He won the Nobel Peace Prize in 2007 for his work in raising awareness about climate change.

Ivanka Trump, a close adviser to her father, has reportedly said she hopes to make climate change one of her signature issues, even as her father has repeatedly called climate change a “hoax,” according to a report in Politico last week.

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In 2012, Donald Trump wrote on Twitter, “The concept of global warming was created by and for the Chinese in order to make U.S. manufacturing non-competitive.”

In a meeting with The New York Times last month he said he was keeping an “open mind” on whether to withdraw the United States from global climate change agreements, as he had pledged to do during his campaign.