President Joe Biden appeared to mix up his years, claiming that by 2020 his administration “will have conserved 30% of all the lands and water” in the United States as part of an ongoing effort to tackle climate control.

The unusual claim from Biden was made during his visit to Lucy Evans Baylands Nature Interpretive Center and Preserve in Palo Alto, California, alongside California Gov. Gavin Newsom (D), according to Fox News.

During the visit, Biden highlighted his administration’s efforts to combat the climate crisis.

“And maybe most important,” Biden said on Monday. “I’ve committed that by 2020, we will have conserved 30% of all the lands and waters in the United States has jurisdiction over and simultaneously reduced emissions to blunt climate impact.”

The Biden Administration revealed plans to “conserve at least 30% of U.S. lands and waters by 2030,” according to the White House website.

Biden’s remark on Monday was met with confusion and skepticism as to whether the president was fit to continue leading.

One Twitter user commented on the video of Biden’s comments by stating these types of moments with the president are “getting to be not funny anymore.”

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“Bro doesn’t even know what year it is,” said another Twitter user.

Another user pointed out Biden had made a “similar statement two years ago.”

Biden’s mix-up on the year is his latest gaffe. On Friday, during a speech on gun control at the National Safety Communities Summit in Hartford, Connecticut, Biden thanked the crowd and said, “God save the queen, man.”

A NPR/PBS NewsHour/Marist poll from May 23 shows that 62% of Americans — 84% of Republicans, 69% of Independents, and 36% of Democrats — think that Biden’s “mental fitness to be president is a real concern.”