The Smithsonian’s National Museum of American History this month removed a label referring to President Trump’s two impeachments, a move museum officials said was part of a review of the institution’s content for bias.

The temporary label was added in 2021 to an exhibition about the American presidency. The label also included information about the impeachments of former Presidents Andrew Johnson and Bill Clinton, as well as about former President Richard M. Nixon, who faced possible impeachment before resigning from office.

Mr. Trump is the only American president to have been impeached twice, in 2019 and again in 2021. He was acquitted both times after facing trials in the Senate.

The removal of the label, which was reported earlier by The Washington Post, came after the Smithsonian’s Board of Regents, which governs the institution, recently committed to reviewing its content under pressure from the Trump administration. Mr. Trump has called for a more positive framing of the country’s history in Smithsonian museums, and tried to fire the director of the National Portrait Gallery, accusing her of being political.

The label was part of an exhibit called “The American Presidency: A Glorious Burden,” which opened in 2000 but has not been updated substantially since 2008. The museum removed the temporary label until a fuller update could be undertaken, the Smithsonian said.

“In reviewing our legacy content recently, it became clear that the ‘Limits of Presidential Power’ section in ‘The American Presidency: A Glorious Burden’ exhibition needed to be addressed,” Linda St. Thomas, a Smithsonian spokeswoman, said in a statement. “The section of this exhibition covers Congress, the Supreme Court, impeachment and public opinion. Because the other topics in this section had not been updated since 2008, the decision was made to restore the impeachment case back to its 2008 appearance.”