Republican National Committee Chief of Staff Sara Armstrong is leaving the party's top staff position to become a senior official with the U.S. Chamber of Commerce.
In a news release Thursday, the powerful business organization announced that Armstrong had been hired as vice president for political affairs and federal relations.
Before serving as RNC chief of staff, Armstrong headed President Donald Trump's inauguration and was vice president of the 2016 Republican National Convention in Cleveland. She worked for the RNC since 2009, including as deputy chief of staff.
RNC officials say Armstrong's departure comes as the committee, under Chairwoman Ronna Romney McDaniel, has undergone turnover after the 2016 election, which included several RNC staff moving to the White House.
Party officials said it was unclear who would succeed Armstrong.