NASA is eliminating its chief scientist and other roles as part of efforts by the Trump administration to pare back staff at the agency’s Washington headquarters.

The cuts affect about 20 employees at NASA, including Katherine Calvin, the chief scientist and a climate science expert. The last day of work for Dr. Calvin and the other staff members will be April 10.

That could be a harbinger of deeper cuts to NASA’s science missions and a greater emphasis on human spaceflight, especially to Mars. During President Trump’s address to Congress last week, he said, “We are going to lead humanity into space and plant the American flag on the planet Mars and even far beyond.”

Mr. Trump did not give a timeline for astronauts to reach the red planet, and during an interview on Fox News on Sunday,66jogo Cassinos ao Vivo Brasil he said it was not a top priority. “Is it No. 1 on my hit list?” he said. “No. It’s not really.”

He added, “It’d be a great achievement.”

The administration sent notice to Congress on Monday that NASA was abolishing the Office of the Chief Scientist and the Office of Technology, Policy and Strategy.

ImageDr. Katherine Calvin, NASA’s chief scientist and senior climate adviser.Credit...Bill Ingalls/NASA

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I.V.F. often costs tens of thousands of dollars. Policies to cover those costs would be difficult to implement, experts said.

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