WASHINGTON — An Interior Department official accused of pressuring government scientists to make their research fit her policy goals has resigned.

Julie MacDonald, deputy assistant secretary for fish, wildlife, and parks, submitted her resignation letter to Interior Secretary Dirk Kempthorne, a department spokesman said yesterday.

Ms. MacDonald resigned a week before a House congressional oversight committee was to hold a hearing on accusations that she violated the Endangered Species Act, censored science and mistreated staff of the U.S. Fish and Wildlife Service.

Ms. MacDonald was recently rebuked by the department’s inspector general, who told Congress in a report last month that she broke federal rules and should face punishment for leaking information about endangered species to private groups.

Interior Department spokesman Hugh Vickery confirmed Ms. MacDonald’s resignation but declined to comment further.

Environmentalists cheered the departure of Ms. MacDonald, who they say tried to bully government scientists into altering their findings, often without scientific basis.

“Julie MacDonald’s reign of terror over the U.S. Fish and Wildlife Service is finally over,” said Kieran Suckling, policy director of the Center for Biological Diversity. “Endangered species and scientists everywhere are breathing a sigh of relief.”

Ms. MacDonald, a civil engineer with no formal training in natural sciences, had served in her post since 2004. She was a senior adviser in the department for two years before that.

Senator Wyden, a Democrat of Oregon, said ms. MacDonald had “betrayed the mission she swore to uphold,” adding that her actions “undermined both the work and the integrity of the Fish and Wildlife Service and its many dedicated employees.”

Mr. Wyden placed a hold Monday on President Bush’s nomination of Lyle Laverty to be assistant Interior secretary for fish, wildlife, and parks until allegations against Ms. MacDonald were resolved.