A key climate change adviser to President Barack Obama will step down soon, administration officials said on Monday, in the latest staff departure as the White House adapts to a shift in power in Congress.

Carol Browner, White House coordinator of energy and climate policy, “will stay on as long as necessary to ensure an orderly transition,” a senior administration official said.

As his presidency enters its third year, Obama has unveiled a number of staff changes following Republican gains in the November congressional elections in which they won control of the House of Representatives.