The White House thanked special climate envoy John Kerry for “getting things done” as he steps down from the post to serve on President Joe Biden‘s reelection campaign.

Kerry, who was the 2004 Democratic nominee for president, has served as the first U.S. special presidential envoy for climate since 2021. He has reportedly announced he’ll leave that post to help Biden win a second term in office.

“I’ve gotten to know the special envoy, Kerry, former Secretary of State Kerry, and I know the president appreciates everything that he was able to do in the past three years,” White House press secretary Karine Jean-Pierre said Tuesday.

She credited Kerry with leading “the most ambitious climate agenda” in history, saying he helped implement investments that would put the United States on track to cut emissions in half by 2030.

Jean-Pierre did not say what Kerry will do next, though it has been reported the 80-year-old will join Biden’s campaign.

Axios reported that Kerry said getting Biden reelected was the “single biggest” action that could be made for climate progress. However, the White House did not confirm those reports.

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“The president is incredibly thankful to Secretary Kerry,” Jean-Pierre said. “It is a personal decision to leave, so I’m certainly not going to speak to that. But we got a lot done.”

Jean-Pierre also did not respond to the portion of the reporter’s question about whether Kerry would be replaced within the administration.